I suddenly picked up “allergies*” in my late 30s - couldn’t work out what they were, other than antihistamines (cetirizine or loratidine) made them “not as bad”, and I also needed to avoid certain things in particular (breathing in dust, aerosols, perfumes, other chemical fumes, car fumes, cigarette fumes, wood dust and drinking alcohol).

Turned out to be Nasal Polyps. I was due for surgery to remove them in 2020, but then Covid happened and I’ve been on a waiting list since. Surgery may completely remove the problem, or at least lessen it - but they could grow back within five years.

Basically every day is like I’ve got cold or sometimes flu. Sometimes I feel like I’m drowning in phlegm. If I take antihistamines, it’s pretty mild or controllable, as long as I can reasonably avoid those triggers. Sometimes I have to drink lemsip in the morning (powdered hot drink of paracetamol, lemon flavour & decongestant). It’s there every day, permanently, but how severe it is varies between “slightly inconvenient” and “too unwell to work”.

Antihistamines are essential for me to function at all, and make a huge difference - though I feel they’ve become less effective in the last year or so. Thankfully they’re very cheap over the counter (~£1.30 for 30 days’ worth). I also use a saltwater nasal spray sometimes, and I sometimes eat a lot of menthol sweets. I have to be careful with decongestants to avoid “rebound congestion” where your nose adjusts to life with decongestants, then becomes twice as blocked up if you stop.

If I drink alcohol or breathe perfume etc, my sinuses block up within half an hour, I can get an asthmatic response, and I get crippling arthritic pain in my hands and joints. Sometimes perfume and other sprays can cause severe, possibly dangerous breathing problems. I have an asthma inhaler for these emergencies, and always have to carry it with me, in case someone sprays perfume in an enclosed space (which might cause me to die).

If I keep reasonable control over these things, I can live pretty “normally”. If I actually get a cold, it’s like I’ve got a “double cold”, and it can make me too ill to go to work.

When it’s bad, it’s a pretty miserable existence to be honest, but in the larger scale of things it’s not a serious or life-threatening illness, so you feel guilty for complaining.

When it’s not so bad, I can normally ignore it for most of the day. It’s worst in the morning/night when I’m horizontal.

Your case outlined in the original post sounds particularly upsetting and you have my sympathies.

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*technically it’s an intolerance or hypersensitivity, and not truly and allergy, though it behaves in much the same way, and symptoms can be controlled in much the same way.