I don't know what's wrong with me..

So Friday night I got drunk from a cup of vodka I'm a light weight lol and Saturday I had a stomach and headache like a hangover but it continued onto Sunday and now even Monday. It feels like I'm being stabbed in the stomach or once i eat something I feel like just throwing it up and I get headaches too. I'm not sure what it is and was wondering if anyone else has felt like this before?