Heres a little tidbit i found while doing research a while ago..
http://www.erowid.org/plants/mushroo...medical1.shtml
I'm not encouraging anything there, just though that was interesting
Try seeing a neuromuscular massage therapist. If your migraines are not chemical in nature, its highly probable they are caused by muscle tension. I'm actually in massage therapy school right now, and its been amazing to me to see what NMT (neuromuscular therapy) can do for a persons headaches; even debiliating migraines.