My wife had daily level-10 headaches for years. She did Nerve Decompression a few times (all failed). You may wish to look up Dr. Jeffrey Brown in long island, New York. Dr. Peled told us there was nothing he could do beyond what was already done, but Dr. Brown, with his cutting-edge high resolution MRI, saw blood vessels wrapped around nerves in the brain (yes, scary). He went in, and now she only gets menstrual migraines and an occasional (much) lesser one. The chronic daily migraines are gone. I can provide more info if interested.