When I first got RSD I had lower lumber sympathetic blocks and the first one only lasted about a month. I could go in one day and get the block then walk out the same day without crutches. The next block lasted a little longer the next a little longer. Then I had to do physical therapy because I couldn't get the blocks anymore because the clinic dropped my insurance. So I did physical therapy and I was on my meds. The physical therapy took six months but it allowed me to go into remission. Then when I was in remission I was off all meds. I was in remission for about a year and a half then it came back and I did physical therapy again and it's been 5 months of remission since.