Alcohol intolerance?

I (M25) used to enjoy drinking casually in my early 20s, I felt like I could drink quite a bit with minimal negative side affects during and the day after. Even after a day of heavy drinking my hangovers were usually quite tame. I’m not sure what happened since then, but now just a few years later I nearly can’t stand alcohol. Often, the thought of it makes me feel sick to my stomach and drinking a single drink makes me feel sick. Headache, nausea, depressive mood, acid reflux, and hangover like symptoms the next day even after a small amount. It’s gotten to the point that it’s affecting my social relationships, most of my friends and my fiance enjoy going out to drink or having parties and getting drunk and I would love to participate but i just can’t. Beer is hard enough, liquor is an absolute hard pass, and as someone with social anxiety and am naturally introverted it’s difficult to enjoy being in these situations when all my friends are having fun being drunk and I’m stone cold sober. I think it’s worth noting that I’m a daily cannabis user in case it’s relevant, I don’t really enjoy being high in a social setting just at home. What happened to me?