I go to a brewpub from time to time that has some pretty good beers, one even took an award recently. Thing is, every time I drink there, without fail, I wake up with crushing headaches the next morning. It's a bit of a drive so I limit myself to 3 pints (not even remotely in hangover territory for me) and I'm not the only person who has noticed the headaches.
I understand fusel alcohols can cause headaches, but I don't detect any solventy, or hot alcohol off flavors. No off flavors of any sort come to think of it.
Any ideas what might cause this?