Why am i getting these strange headaches?

About a week ago i decided to get my hair buzz cut so i was nearly bald, this was the closest ive been to bald since i was a baby. Ever since i got my hair cut i have been getting these strange headaches that seem to come about unprovoked, im wondering if my scalp, having never been exposed to direct sunlight like it has been recently has absorbed soooo much vitamin D that im getting headaches, or maybe its just my Caffeine withdraw, probably be better off asking a doctor, thought id try this first.