Origin of Migraine?

Looking for a martial arts school (Krav Maga, Systema, or similar) that emphasizes real fighting ability, not pretend kung fu shit, but where I donโ€™t get hit in the head a lot. Got hit in the head, hard and frequently, as a kid and it did not result in good things. Donโ€™t think I got it as bad as football players do, but then again I had no helmet and little to no warning. Need to preserve my brainpower.

Will see what I can findโ€ฆ.