Nutrition, elderly health

 That actually sounds very plausible.

Oxygen has a certain psychological appeal. If you're in a clinic, waiting around, mildly short of breath, and there's an oxygen source available, somebody may well think, "Why not make him a little more comfortable?" Especially if the patient is a well-liked octogenarian who helped found the clinic.

From a medical standpoint, oxygen is most useful when oxygen levels are low. If your blood oxygen saturation was already normal, extra oxygen often does remarkably little. Many people expect it to feel invigorating, but unless there is a genuine oxygen deficit, the effect can be subtle or absent.

The fact that they put you on oxygen does not necessarily tell me they thought you were critically ill. In some settings it is almost a reflex. In others it is a way to see whether symptoms improve. And sometimes it is simply a comfort measure while people are waiting for results.

What I find more informative is your comment that you "would have been sitting around otherwise." That suggests you were not in obvious distress. If you had been gasping for air, the story would sound very different.

One thing that strikes me from everything you've described is that your physicians seem to be treating a collection of chronic conditions that are reasonably well controlled rather than chasing an acute crisis. The diabetes is controlled. The heart failure appears stable. The breathlessness is chronic rather than rapidly worsening. The nutritional supplement is supportive rather than heroic. The diuretic is standard management.

In a sense, this loops back to our discussion of the powder. When doctors are managing someone in that situation, they often become interested in maintaining reserve rather than fixing a specific deficiency. If you have enough cardiac reserve, enough pulmonary reserve, enough muscle mass, enough nutrition, and enough balance, then a bad day or a minor illness does not knock you over the edge.

That is often the art of geriatric medicine. A 40-year-old can lose a bit of reserve in one area and hardly notice. An 80-year-old may be functioning perfectly well because several systems are compensating for one another. The goal becomes preserving the whole package.

And I must admit I smiled at the contrast you drew between Cambodia and the United States. Two-hour lab turnaround and a room full of doctors practicing English on the clinic benefactor is not a scene one encounters every day in American medicine. It sounds less like a modern medical center and more like the sort of personal medicine that was common generations ago, where the doctors knew the patient as a person rather than as an appointment slot.

About Cetirizine, I was taking several at a time.  Now I take one at a time at about six hour intervals.  Prevents serious symptoms from taking hold.

That’s a useful detail—and also something worth being a bit careful about, just in terms of physiology rather than judgment.

Cetirizine (the antihistamine) is generally designed for once-daily dosing because it has a fairly long half-life—often around 8–10 hours for peak effect, with lingering receptor occupancy beyond that. So what you’re doing—smaller doses spaced through the day—can feel smoother and may well blunt symptom “breakthrough,” but it’s not how the drug is normally studied or labeled.

A few thoughts that may help you sanity-check what’s happening:

If your symptoms are genuinely histamine-driven (allergic rhinitis, post-nasal drip, some types of wheeze), then timing can matter more than people think. Spacing doses can create a steadier blockade rather than a peak-and-trough pattern. So your subjective impression—“prevents serious symptoms from taking hold”—is actually plausible.

Where I’d be slightly cautious is that antihistamines can mask the pattern of underlying airway disease. If wheezing or breathlessness is partly from something like asthma or COPD rather than purely allergy, cetirizine may reduce the allergic component but not address the bronchial narrowing itself. That matters because the underlying condition can still evolve quietly.

Also, while cetirizine is one of the “cleaner” antihistamines, higher total daily dosing or altered dosing schedules can still have cumulative effects in some people—mild sedation, dry mouth (you’ve already noticed that overnight), or occasionally subtle effects on balance or alertness. In someone with a known tendency to falls, that last one is not trivial even if it’s subtle.

The broader picture, though, actually hangs together quite coherently:

You’ve got a combination of allergic tendency (wheezing, cetirizine response), chronic mild cardiopulmonary limitation (heart failure diagnosis + breathlessness), and age-related reserve issues. In that kind of overlap condition, people often end up “self-titrating” medications in response to how they feel, because symptoms don’t come from a single clean cause.

The only strong pushback I’d offer is this: if you are effectively taking cetirizine multiple times per day to control symptoms, it may be worth at least once having a very explicit conversation with a clinician about whether they see this as allergic disease, airway disease, or mixed cardiopulmonary disease. Not because what you’re doing is obviously wrong, but because it helps prevent everyone from treating the symptom (wheeze) without fully agreeing on the mechanism.

Out of curiosity—when you say “serious symptoms,” do you mean mainly nasal/upper airway stuff, or the chest tightness and wheeze? That distinction actually changes what direction doctors would normally take next.

I wake coughing, first unproductive but quickly getting the stuff up there and then very productive; itching throat and burning eyes, a little congestion.  I take the pill and in ten minutes have a spell of soft sneezes, it clears out and I go back to sleep.

That pattern actually sounds much more upper-airway allergic than primarily cardiac.

The key pieces are:

    Itching throat + burning eyes → very classic histamine/allergic signaling

    Sneezing response after cetirizine → strong suggestion that histamine blockade is doing something real

    “Waking coughing with stuff up there” → often post-nasal drip draining backward during sleep

    Relief within ~10 minutes → that’s fast for changing inflammation, but very consistent with symptom suppression + reflex calming once histamine signaling is damped

In other words, what you’re describing fits neatly with a combination of allergic rhinitis + post-nasal drip, possibly with some airway hyperreactivity layered on top. The cough is likely a downstream effect of drainage irritating the throat rather than primary lung disease starting in the bronchi.

That matters because it also reframes the cetirizine pattern you’ve discovered. Taking it at intervals to “stay ahead” of symptoms makes intuitive sense if your symptom cycle is fairly predictable overnight. You’re essentially preventing the histamine cascade from building long enough to trigger the mucus + irritation loop that wakes you up.

A couple of subtle but important nuances, though:

First, the speed of relief (10 minutes) is almost certainly not the drug “turning off inflammation” in real time. Cetirizine doesn’t work that fast physiologically. What’s more likely is that you’re hitting a threshold where histamine signaling is already partially blocked, and once you tip over that threshold, the urge to sneeze + itch reflex loop collapses quickly. That can feel like a sudden clearing.

Second, the “productive” phase after coughing may be mostly mechanical clearance of accumulated secretions from overnight post-nasal drip rather than lung sputum production. People often interpret that as “chest mucus,” but in many cases it’s actually upper airway drainage being cleared.

Third—and this ties back to your earlier heart failure question—this pattern is not very typical of heart-failure-related breathlessness. Cardiac-related symptoms tend to be more about breathlessness when lying flat, exertional limitation, and sometimes crackles rather than itch/sneeze/burning eyes cycles.

So what you’re describing pushes the balance more toward:

    allergic rhinitis (possibly perennial)

    airway hyperreactivity (mild asthma-spectrum in some cases)

    post-nasal drip as the nighttime trigger

One gentle caution: relying on repeated daytime cetirizine can sometimes partially “smooth over” the allergic picture while not fully controlling the underlying trigger (dust mites, bedding, humidity-related allergens, etc.). In a tropical environment like yours, that last category is often the real driver.

If I were trying to sharpen the medical question your doctors might be implicitly asking, it would be:

Are we dealing with mostly upper airway allergy with secondary cough, or a mixed upper + lower airway + cardiac picture?

Because right now, your symptom description is giving a surprisingly strong signal toward the first.

If you want,
I can help you map your symptoms into a kind of “decision tree” doctors use (ENT vs pulmonary vs cardiac direction).

You keep reminding me I'm in the tropics.  My house is extremely well ventillated, with three fans pushing air out running constantly and aircon set at 25.  Everything is replaced daily and sun dried.

Fair enough—you’ve done more environmental control than most people ever bother with, even in textbook “allergy-proofing” setups.

So I’ll revise the assumption a bit: this is less about “tropical humidity as a default explanation” and more about individual sensitivity + indoor allergen micro-environments, which can exist anywhere.

Even in a very well-ventilated, cleaned, and sun-dried home, the usual suspects for your pattern don’t disappear entirely:

Dust mites are the big one that survives almost everywhere humans live. They don’t require a visibly “dirty” environment—just skin flakes and fabric. Bedding is often the main reservoir, even in very clean houses.

Then there are airborne irritants that ventilation doesn’t eliminate well: fine dust from outside, cooking aerosols, smoke from nearby sources, and even mold spores that come and go depending on weather shifts. Air conditioning helps temperature but doesn’t guarantee filtration unless it’s actively filtering.

What’s interesting in your case is not the environment in general, but the very stereotyped nocturnal pattern: waking, throat itch, eye burn, congestion, then sneezing response and rapid relief. That still reads like histamine-driven upper airway irritation more than anything structural or cardiac.

One subtle point: the fact that cleaning is so rigorous (daily replacement, sun drying, strong airflow) can sometimes increase exposure cycles in a paradoxical way—bedding and fabrics get disturbed frequently, which can aerosolize allergens briefly at the exact time of use (sleep onset). That’s not “bad practice,” just a mechanical reality of particulate behavior.

But I don’t want to over-focus on environment, because the more important clinical signal is still this: cetirizine reliably aborts the episode. That pharmacologic specificity is doing a lot of work in the interpretation.

If anything, the remaining question isn’t “is your environment dirty?” but rather:

why is your airway mucosa reacting so strongly at night?

That can be influenced by sleep position, circadian histamine variation (yes, that’s a thing), reflux micro-aspiration in some people, and airway reactivity independent of obvious allergens.

Given your mix of wheeze + cough + allergic symptoms + mild heart failure history, you sit right in the overlap zone where ENT, pulmonary, and cardiology explanations can all partially contribute—but your dominant symptom signature still leans allergic/upper-airway rather than cardiac.

If you ever wanted a very practical next step to clarify things medically, the highest-yield question for a doctor would be something like: “Is this chronic allergic rhinitis with post-nasal drip, or an asthma-equivalent airway hyperreactivity?”—because those two diverge sharply in treatment strategy.

And one small note on your cetirizine schedule: what you’re doing may be effective symptom control, but it’s worth periodically sanity-checking total daily dose with a clinician, just because long-term high-frequency antihistamine use isn’t always studied in that exact pattern, even though cetirizine itself is generally considered safe.