Actually, I wonder if you don't have sex-induced migraines?

https://migraine.com/migraine-triggers/sexual-activity/

Keep in mind that the pain from a migraine ranges from mild to "OMFG!" and often for me, when I get migraines, it's almost like being hung-over and goes on for a couple of days. It might be something to have the doctor check out.

Oh, and you're not too old for sex.