For the past couple of months every time I've had more than about 3 pints I've ended up having to be sick before going to sleep and I've woken up with worse hangovers than I've ever had. I'm only 20 and I've always been able to drink much more than this without problems, so I have no idea why I suddenly can't keep it down. Anyone else experienced this?
I've read about this happening to a few unlucky people before. Even people who've been regular drinkers for years somehow become allergic to it almost overnight, and even a little bit of it totally KO's them. Maybe you're one of the unlucky few.