I've had a constant headache for almost two weeks now. It's usually a dull pain, but very recently started becoming more intense and sharp. It worsens with movement and I get very dizzy easily. I've had migraines for over ten years now, and I definitely don't think it's migraine-related. I tried taking Advil, excedrin, as well as prescribed sumatriptan but nothing helps. Any ideas as to what it is and how I can make it stop?