Greetings: I have had three nerve blocks and none of them have really helped me. the third one had a steroid in it and lasted about 1 wk. I don't believe that they are worth the time, discomfort and money unless they are working well for you. I have been using something that I got on the internet called DMSO. A fellow at my church said that he has been using it for pain relief for 40 years. If you can, get your doctor to give you some cortizone (10 to 1; mostly DMSO), it could help further. I haven't gotten the cortizone yet. I am 9 months into my RSD. Good luck to you.