I am 27 years old, use to be able to drink quite a bit of alcohol - never binge but could drink 3 to 4 drinks in a night and be fine. Recently I have not been able to even have one drink without passing out approximately 2-3hours later. After waking up from passing out, I vomit until nothing is left. The first time I thought maybe I just wasn't feeling well that night, now it has been 5 or 6 occasions and I know something is not right. I have not been drugged, because on each occasion it has been with a family member or close friends in my home. The drinks that have caused this would be diet cream soda and vodka, crystal light pink lemonade and vodka, and rum and coke. Any ideas?