I've gotten carsick since I was a kid. I was also told at age 6 by Sick Kids Hospital in Toronto (where my mom took me) that I was experiencing migraines, so headaches have been a lifelong thing.

My current neurologist said that car sickness not caused by ear issues is due to migraines. Interesting!

Edit: Interesting about the Naproxen. I never thought to ask for that before as far as regular headaches went (I've taken the 500mg guys plenty of times for facial pain not headache).

Maybe if I still have pain Tuesday (which I do currently from my cheekbone on the left side, up to near the center of my scalp on that side) I'll ask my GP about it when I go in to see her.