I too (because of Work Comp) had a series of 3 Sympathetic Nerve Blocks. Just like Karen they sent me into a state of complete pain - Injured Knee went crazy - had to have cortisone injection in my knee. It was awful. My pain doc said "Well, this confirms that your (SIP) Sympathetically-Independent Pain". So now I am trying a trial Spinal Stimulator to see if we can reach that SIP directly. Hope this helps.