the never-ending months-at-a-time kind??? Mine used to come only for a few days when seasons changed, but this time it's been hanging around since October. We've tried oxygen, verapimil, zonegran (i have epilepsy also, so we increased the dose), two nerve block injections. I'm currently getting weekly UV magnesium treatments. Everything works for a day or two and then the headache comes roaring back. Any suggestions would be greatly appreciated!