Increased alcohol/hangover sensitivity?

Over the past 6 months or so I’ve noticed that I get hangovers far more often than I used to which is weird because I don’t know why. I’m not old, I’m still an university student.

My hangovers mainly consist of nausea and just overall feeling shitty and tired. I don’t get headaches, never did. Around 7 months ago I didn’t even feel nauseous after a night of drinking. I always just felt like I hadn’t slept enough, no signs of a hangover EVER! My sleep also wasn’t as disturbed when drinking alcohol as it is now.

Does anyone know why this is happening??