This just started happening around a week ago. No medical issues.. Just started out of the blue. After I masturbated, ejaculation, as usual happened. Instantly after ejaculation I got a horrible headache. The headache is one of the worst I've ever dealt with. First, I thought nothing of it, but as time went on.. It kept happening. Not only by myself, but with my girlfriend as well. The worst part is the first 10 minutes, and it slowly diminishes in around an hour long duration. The pain is a pounding pressure in the left area of my head, if that gives any insight? Anyone ever hear of anything like this?