Alcohol illness?

Looking for some help with something that has been happening to my boyfriend with drinking recently! We are both casual drinkers, we have a couple beers with friends on weekends or on holidays. He never gets out of hand, or has many, and he’s never overly drunk the night of, we just go to bed and everything is fine.

Every once in a while, after drinking he wakes up SO sick, like his whole body is soaked in sweat, but he’s freezing cold, his body is sore, his head hurts, and he can’t keep even water down for like 10-12 hours.

Has anyone ever had anything like this? I would love to know what is causing it, we are still young and when it only happens every 1 in 5 times I don’t understand how it can be just him drinking?