[I had cervial blocks. I tried twice, and for me it didn't work. Then I had Katemine infusions, and that did work, for about 3 weeks for each one. I got results the same day of the fusion.
In my case it isn't RSD. I have NP, which is not as severe as RSD. I hope to heck I don't develpe that malady. Sorry you have to go through that. I had to go through a second spinal fusion to get acceptable long lasting results. I am 22 months post op. Use that cool pack and take tylenol, that should help. If the block works you should feel better pretty soon. let me know how you do. None of these things are easy to go through. ginnie