Terrible headache won't go away?

I have a really bad headache. It won't go away, it's been getting worse over the past couple weeks. I've had chronic headaches and stuff for four years. They got worse a couple years ago, then weren't as bad. But they've been getting worse again. Nothing helps. I've tried so many things (acupuncture, chiropractor, allergy testing, medications (Depakote, propranolol, Topamax), got an MRI and CT scan and I don't have any tumors or anything. OTC stuff doesn't help at all. I've tried tylenol, advil, excedrin (extra strength and tension headache), sudafed sinus congestion, afrin nose spray, aspirin, zyrtec (I take that every day). I don't know what to do anymore... It really hurts