Nerve Blocking Shot

Although my outbreak is now under control with a lot of drugs, i just went to a pain clinic for the fun of it. The doctor was pretty high on giving a nerve blocking shot, saying it might work well and might just work a few days or so. just have to see. Has anybody had experience with this type of treatment, that being a nerve blocker. I just do not seem to have heard to much about it. For me this would be more for future outbreaks which i accept will come again down the road. I just wondered if have a nerve block is worthwhile. I might mention i am going to see a neuro-surgeon in a few days to explore other options too. Any thoughts on the shot would be appreciated. He also would consider opiates too down the road.