How can I drink again?

Ok basically probably 2 weeks ago I was at a party and I guess I over indulged. I didn’t think I drank too much but I did and I don’t remember anything except for throwing up a lot. I even saw pictures of me drinking things that I’ve never seen in my life. Anyways the next morning I was extremely hungover and it was the worst it’s ever been. I was hungover for probably 2 days and then I felt better and I feel fine now. But I tried to drink the week after and my body just wouldn’t let me. My stomach hurt and burned whenever I tried to take a sip and even light alcoholic beverage made me gag and almost throw up. Then I tried again this weekend and the same thing. My friend told me that happened to him and he said it’s because the alcohol killed all of the good bacteria in your stomach and it took like 3 months to recover. I’m not sure if he knows what he’s talking about but does anyone know why this is happening or how I can fix it? Hopefully faster than 3 months.