I was popping my neck the other day when something strange at the base of my neck and head popped. It felt weird, but I didn't think anything of it at the time. Ever since then, I've had sporadic instances where an unbearable headace would just appear in that area of my head. Some people say that I've pinched a nerve. How do I cure this if that's the case. If that isn't the case, what's wrong and what can I do to fix it?