Can’t drink anymore, can someone help me?

Ok, so almost a year ago I was at a party, and I happened to have drunk a little too much than usual. So even though I had eaten before I started drinking, It took a single fry to make me suddenly feel sick and then throw up all night. After that happened I decided to start drinking less at parties, also because I couldn’t stand beer anymore. And now the problem: I started drinking again at parties for a few months now, but when I drink enough to be “inebriated”, all I need is a paranoid thought to make me feel the need to throw up. I’m afraid to drink now because if I accidentally think something like “what if I feel the need to throw up?” suddenly my body makes me relive something similar to when I actually threw up, despite maybe I drank very little. How can I overcome the trauma of that night?