I had this problem really bad for a while or if I take a hard step or quick movement. I've found out for me that it is a result of stress and nerve and structural issues in my upper neck!

Perhaps at first, my actual brain was sensitive, but I'm not sure.

I know, now, what a stress (tension) headache is and what isn't. A lot of my headaches then were tension.

I'd recommend finding how to relax yourself. I love meditation and light yoga. It takes a while to get comfortble with it, but anything to help recovery!

I'd also recommend perhaps sitting on a pillow and wearing a neckbrace in the car!

Praying for you!