Ok, I talked to DD. She went to a Neurologist who referred her to a different nerve specialist, she couldn't remember the specialist exact title. She had a MRI, required, and then the nerve block shot. She said it was given at the brain stem and her head went numb for about five minutes. The shot shocked the nerve that was hurting and that stopped the pain. The other nerves that wasn't agitated wasn't affected at all. The shot block lasts her about 18 months and then she gets another one if a shingles outbreak repeats and causes her pain. She said the shot is given to fibromyalgia patients that had severe pain. She said the shot didn't hurt at all.