After dinner, 1 sip cocktail. burning sensation in neck, across shoulders, left arm for 5 min. 1 burp. diarrhea after. heart? indigestion?

Prob GI, get checked: The symptoms sound like there is a GI component with the alcohol involvement (can be a trigger), as well as the gas and the diarrhea. You can never be too safe though, and a routine eval with your dr. And an ekg will help assure your heart is stable. Avoid the triggers that may cause heart burn at this time. Best wishes.