Hi, Traveler. I work at a chronic pain management clinic. We perform literally 100's of different "nerve blocks" as you are calling them. Mostly neck, including head and arm pain; and back, including hip and leg pain. Some are performed in an outpatient setting, others are performed in a treatment room. It depends on your chronic condition and what "nerves" are ultimately involved. Lots of people get good relief from the "blocks", from several months with some to 1-2 years with others. Injectables vary, including numbing medicines and steroids. A good Dr will use fluoroscopy with some light sedation for comfort. There is no permanent loss of function. Numbness can occur and may last for several hours afterwards, but movement returns fully. Most pain management clinics require a referral from your treating physician. There aren't very many pain clinics out there. Well, good ones, anyway. We have patients travel as many as 2-3 hours to be seen. I thought I could touch on a good website listing available pain managment doctors, but my own doctor isn't listed on the one I looked at, so a little more research is required on my part for that bit of info. Hope this helps a little.