I keep getting weird, throbbing headaches in the top of my head. It feels like sinus pressure, like when you're sick and you bend down and your head feels like it's going to explode...only not in my sinus cavities. Sometimes while I have these headaches, I get a quick, stabbing pain in the same area. Is this just a tension headache or should I be concerned? I've tried massaging my head, but it doesn't seem to help.