Why does alcohol make me so sick?

I’m 29 and have always been able to handle my booze. I don’t drink super often but will occasionally have a few drinks on the weekend. Used to be able to drink maybe 12 beers, but now I can’t have 2 without feeling super sick in the morning. It’s not just beer, it’s everything alcoholic. It’s like my body is completely rejecting alcohol. The morning after has been a super hangover for me and it stays that way into the next evening. It’s been taking a full day of recovery. I usually drink a glass of water between each drink and even that doesn’t help. Anyone else experience this?