My 2 sympathetic blocks were not successful either. 2 lsb's, 2 weeks apart. The first one did not give me any warmth. The 2nd gave me warmth but my pain actually increased. My initial PM felt I didn't have crps because of this but he referred me to his partner for a SCS. Sometimes I think it is best to change groups and get a broader picture. I had 3 specialists tell me I have crps and 1 (my initial PM) doubted it. Mine was finally confirmed with biopsy done by a much more experienced PM. My initial PM didn't have the breadth of experience to know that one can have sympathetic independent pain (SIP) AND crps. From what I understand SIP crps is a bit more difficult to get into remission. Good luck.