How you described your PATM IS literally word for word, the same as mine. It used to be the occasional comment of, I smell ****, have you farted? I was so determined to cure myself that i, stupidly, thought antibiotics would cure me. Oh no, I began getting coughing, sneezing, clearing throat, constantly!
Now I'm in a position where I have just started a new job, I had the induction friday, sat round a table of which people were, coughing constantly. It was a horrible day to say the least.
As to your question of what works, well, I have tried healthy diets and all the supplements, nothing had much effect. I'm now starting to believe that our stress and anxiety, feed patm, although I don't think stress is a direct cause. I really struggle to understand this illness. It makes me feel like an alien.