Tension headaches

Hi girls! I get appallingly bad tension headaches, and I'm struggling with a way to fix them. I go to the physio once a month to get my shoulders and neck ironed out, but I still get headaches at least once a month, more like once a fortnight. The only thing that helps is to take a couple of Nurofen and either stand under a hot shower, or curl up in a ball with my eyes shut, until it stops hurting. Any suggestions for ways to get rid of them, or at least reduce the frequency?