Flovent and Advair have theh same corticosteroid in them -- making a switch from one to the other is unlikely to keep the cortcosteroid from working.
Just to be safe on the topic of the serevent, do switch back to Flovent for a time and see how you handle it. (You don't need to taper since like I said before, it's the same drug. Just take as close to the same dose as possible.)
If your PEF at that moment was normal ... doesn't mean it's normal all the time. But you're already on an antihistamine, so unless you've been on it for yearsandyears, I can't see it being an allergy? Maybe switch antihistamines too, and see how that helps.
Also, buy yourself a peak flow meter, and test yourself when you start feeling tight. If you're actually getting a significant degree of narrowing, it'll show on the PF meter more than anything else. If nothing is conclusive, ask for a referral to a pulmonologist. He'll know better where to go and what tests to do.
I'm sorry about the health insurance thing, PEF meters only cost about $20 to $30 bucks, so that should be okay. As far as the doc goes, I don't know what you're going to do. Maybe consider looking for funding, or going to a charity hospital.
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