I would suggest calling the neuro. & getting something for the migraines. Imitrex is my "best friend" when it comes to that. If he can't get into the Neuro. go for the family Dr. to get something. Migraines are no fun. They are just torture if they have him on the floor.
How old is he? If he's in his growing stage that may have something to do w/ it. The weather (humidity) might have something to do w/ it.
I would work on getting the migraine stopped & worry about why he's having them later.