Diarrhea from Alcohol

Lately, whenever I drink, even if it's one drink, I wake up the next morning with excruciating abdominal pain and diarrhea and sometimes even throw up or feel like I need to, but can't. This can last for an hour or four hours. I'm only 21, and haven't been drinking for long, and this only started happening about two months ago. I'm a vegetarian, not sure if that has to do with anything, take good care of myself and exercise regularly. But now I'm scared to even sip anything because I'm in so much pain the next morning. Any thoughts on what to do or what this may be would be appreciated. Thanks. Tweet