to bad posture - especially at the computer. Or stress.
I know there was a member here years ago who cut her hair because she thought it was causing headaches, and it turned out she still had headaches. It wasn't the hair at all. Unless your hair is very thick or you're wearing it so that it pulls on your neck, I would probably rule out hair and look elsewhere for answers. Although it wouldn't hurt to try different styles to see if it helps. Some styles do seem to put more drag on the hair which results in headaches, but once the style is undone, the headache usually goes.
Sorry I'm not much help.
Progress from June 2006 - January 2011
2a/M/ii
Mid-Dark brown with natural red and silver highlights; fringe/bangs.
Starting length: 25"/62.5cm (BSL)
Current length: 33.5" (Cut back from 38.5" February 2011 following a massive shed.)
New Goal: Healthy hair that I'm happy with!
Current routine: Scalp wash every second to third day using
Chagrin Valley shampoo bars. Finish with acidic rinse (1 tsp ACV or lime juice to 1 to 2 cups of water or herbal tea). Full wash once a week using
A'kin conditioner or an egg wash to cleanse the length and shampoo bars or
A'kin shampoo on the scalp.
Other: Oiling when required with avocado and almond oil or shea butter; regular micro-trims; BBB; wooden comb; Mason Pearson comb; hair sticks, Flexi-8's, Ficcare, and other hair friendly toys.
'Your beauty should not come from outward adornment, such as braided hair and the wearing of gold jewelry and fine clothes. Instead, it should be that of your inner self, the unfailing beauty of a gentle and quiet spirit, which is of great worth in God's sight.' 1 Peter 3:3-4
My Website
On Eagles' Wings (My Blog)
My Method for Scalp Washes 
for our background!