sudden nausea with alcohol

i’m 21, i’ve been drinking since i was around 17-18. i used to be able to drink lots (around a half a bottle of vodka a night, sometimes a full bottle with my ex. or id drink about 12 beers or a full case of seltzers) and i would never be hungover. lately it’s been one or two drinks and i feel sick. is this just sudden alcohol intolerance? will it pass? i used to drink every night, now i only drink two nights a week. it doesn’t matter what i drink, beer or vodka or rum, i either just feel gross or vomit. i miss having fun drinking on the weekends and i’m young. i just wanna be able to go party and feel fine!!