I too have that problem. Never in my life had I had a problem with drinking. All of a sudden 2 years ago the slightest little bit of alcohol in me and I get very ill. I mean vomiting, shakes, sweating...ect. I just figure I developed an allergy to alcohol.
or you could be pregnate. Check that out too!
It sounds like alcohol withdrawal symptoms to me. It doesn't take much to become addicted for some people more prone and usually the withdrawal can start only a few hours after the last drink.
Next time you feel like ****, test it by having a few oz. drink and see if you feel much better. If you do, than you are likely alcohol dependant even if only a social drinker.
If you have doubts. try a few A.A. meetings and they can really help you get away from the booze. Some of us just have to accept we are addicted and not touch the stuff. I tried controlled drinkng for years before giving it up. Hope this helps.
Maybe you have an ulcer? Check into it.