About a week ago I had an arm wrestle with my friend, and suddenly I felt a pop/weird sensation in the back of my neck/head, amd every time I masturbate I get an intense throbbing stabbing pain at the back of my head and goes around my head... I went to the docs and they tested me for brain bleeds etc and found nothing, but they didn't advise me what to do? Its nothing tpp serious but I dont want this pain everytime I have sexual activity... any suggestions to what happened?