I have the same problem! Usually when my hair gets too thick it's more of a problem for me. Instead of getting my hair cut I usually get it thinned down. Most hair places have a tool that they can run through your hair and thin it down without taking the length off your hair.
It could also be the shampoo you are using. I used to use a shampoo that gave me terrible headaches and I finally had to stop using it. Try experimenting around with your shampoo and see if it helps.
These are just a few of the things that I know effect my headaches and what I've done to help with them. I hope it helps you as well!! Good luck!! Hope your headaches get better!!
Hair Type: 1cNii
Main goal- lengthen, cut down on oil and tangles.