Hey guys, i was wondering if any of you have encountered a terrible head ache while working out. Today, i started out my back work out by doing some wide grip pull ups. While doing my 2nd set, i started pushing it hard and got a horrible head ache. It was very painful in the back of my head. This has happened to me before and when it did happen in the past, i had head aches on and off for about a month after. I have heard that i might need to stretch my back out because i may be pinching a nerve. Any help would be greatly appreciated.