Have you considered either the Michigan Head Pain and Neurological clinic in Ann Arbor Michigan, I saw Dr Prestegaard there for 6 months befor my insurance changed and they became out of pocket and couldn't afford them any longer. A second recommendation would be Dr Teck Soo with Michigan Spine and Brain Surgeons, he just performed my decompression surgery 12 days ago and I honestly had forgotten that life could be like this, virtually pain free, able to take care of my self again, and imagining what my future might actually hold.