If you know it's post nasal drip that's causing the problem then take a Antihistamine
if that doesn't help see an E.N.T. doctor
No No its definatly related to a body issue. i have never had anxiety in my life. and now that my stomach hurts i have it. BUT i figured it out in the last 5 mins. MUCUS! is a irrantant of the stomach! causing GERD! now the question becomes. how to stop the mucus.
It sounds more involved to me than post nasal drip. I am not saying it is very serious, but, I do think your symptoms are anxiety related. I would see a doctor to set your mind at ease.