What’s happened to me

I (25f) used to be able to drink and my body handled it normally. now ONE drink has me feeling absolutely horrible, can barely function, depressed, etc. Like I can’t just have a drink anymore and be anywhere near ok. I used to have a bit of a drinking problem and during that time would rarely feel this inhibited by hangovers. Could I have given myself an allergy by going overboard in my earlier years??