I ran across this website for a group in the UK that performs a decompression surgery for migraine. I’m surprised there isn’t more discussion on this board regarding this procedure. I’m sure there are some controversial aspects of it, but I have read of many people who have received relief from the surgery (and some that haven’t as well). (I’ve also read about several people whose dizziness/tinnitus resolved after decompression surgery for occipital neuralgia, a condition that can mimic or even cause a migraine-like condition.)