I know I have post nasal drip and have taken Claritin, Nasonex, Benedryl and other allergy meds. I am not allowed to take decongestants since I had a heart transplant in 2005. After I eat, within 30 minutes or less, I have conjestion in my bronchial tubes. I've been treated for Bronchitis many times and it clears and returns. I can cough up clear phlem for about an hour and it goes away most of the time until I eat again. It does seem to be more often and worse when I eat yogurt, ice cream, cheese but not milk.