Hi @LLL!
I am VERY reluctant to contradict @spiny, who has been super knowledgeable and a huge help to me, and I don't even know if this is true: but the doctor / surgeon who performed my surgery said there was no MRI or test that could confirm damage to the peripheral nerves. He is extremely well regarded in Charleston (my city) for his expertise in this and other areas, but that doesn't mean Spiny could be right and he could be wrong. But in any case, he told me the best indicator was whether I responded to nerve blocks. If I did not, he would not have in good conscience recommended the surgery. Because I partially did, he said he felt good about performing the surgery.
It was not until a week after the surgery, when I was there to have the stitches removed, that he gave me his findings. These were: both greater occipital nerves were badly compressed and damaged. (He described the specific damage but I won't go into that here, since that doesn't actually really matter much - whether they were damaged or not does.) He was happy: we made the right call.
He continues to have followup appointments with me and we're both happy with the way things are going!
Tiffany
P.S. In the interest of full disclosure, I am also now undergoing the full Vitamin D protocol that has helped so many people on this forum, and also Vit M busting, for the same reason. These I started in earnest after the surgery to address the other symptoms I still had. The surgery was very effective in helping me eliminate, right away, the symptoms you described and it may yet be, as my nerves continue to heal (taking tons of Vitamin B to aid this along with the healing the Vit D provides), that the surgery plays a (big?) part in eliminating in those symptoms too. In studies I read, there were two people of very similar age, condition, and onset (concussion) to me, and this same surgery eliminated all their symptoms, but it took many months for one of them and over a year for the other. Their symptoms did reduce over these time periods, so I surmise it was just the healing process. The nerves were no longer compressed but had to heal from the beating they had been taking.