i agree with bsml...but also thers that muscle when were done eating it wont close all the way..its with age..you mat try over the counter prlosec or presaved..or take prilosec in a.m. and zantac in pm 75 mgs 1aday to start..to see if this helps if it does then get the endoscopy test done from a digestive specialist..
I would wonder if acid reflux is causing the symptoms immediately after eating or drinking.
Also, have you seen an ENT and had a scope done? Some people have problems with the flap that closes the trachea so that things don't get into the lungs while you swallow.
Just some thoughts. Feel better.