I've heard there is a theory that migraines are mini seizures. Another theory would say that seizures are a type of migraine. I know several preventative migraine medications are primarily anti-seizure meds. Personally, I feel my migraines are mini seizures because of how taxed my body is after an attack.

Found this website that talks about it:
https://www.medicinenet.com/migraine_and_seizur...#

i also get grand mal and petite seizures. i dont know any info about the 2 of them together but it could cause headhches when you have a seizure as ive experience.