I had a headache for three weeks, about nine years ago. I'm not sure why it came or why it went, but it never came back. It was bad. I almost fell off the toilet with the pain if I pushed at all. So there is hope for you too.
My wife gets a headache sometimes and she told me coral calcium helps. You could try that. You know, the worst that can happen is nothing.
I also believe in prayer. I had people pray for me at that time. I think that's why I got better.