Suggest Treatment For Nausea And Bilious Vomiting

i am a 21 year old white female, i weigh +/- 65kgs and im about 1.7m. I have recently not been able to drink like i normally can. i was never a heavy drinker. I will go out with friends and drink, i will have only 4 drinks and the next morning i will be extremely nauseous. i recently had a stomach bug and thats the only thing iv been to a doctor for and this had happened before then as well. These symptoms dont always happen, sometimes i can drink a lot and other times i have only 3 or 4 drinks and im getting sick every 30 minutes the next morning. this has happened to me about three or four times in the past 3 months, since it happened the first time it has not stopped. Sometimes if i dont eat in the morning i feel nauseous but cant get sick, then later only bile will come out, please help