Migraines. Thankfully, they went away once I grew up, but every month or so when I was a pre-teen and a teenager I got a blinding headache in the evening that forced me into a dark quiet room for a hour or two and then go throw up, which usually made things feel much better all around. Yup, I got to "enjoy" having hangovers without getting drunk! Probably one reason I never took up drinking. I didn't want more hangovers.
I had the same thing. Haven't had one in about 4 years now, which has been nice. I do drink though and incidentally don't often get very bad hangovers. Definitely none that have kicked my ass like a migraine.