Does anyone know any alternative cures for Migraines?

I get migraines when the barometric pressure suddenly changes, and today I have a really really bad one. I'm allergic to ASA and NSAIDS, so I cant take Tylonol or Advil. I have migraine medication but I cant take it because it knocks me out and I have a midterm in a couple hours. Does anyone know any natural cures or anything? Thanks