So sorry to hear this! I was hoping for the best for you--you've gone through so much and have tried to do all the right things.
I know so little about this....I know that often people need a series of blocks, and that one is not sufficient. But I'm unclear about the significance of the fact that this initial block worked for only a short period of time. Is that what was expected? And is there is any possibility that this response means that you might not have RSD, and that perhaps your nerves are just healing from your extensive surgery? I'm sure Roz and Hope and others can provide more info.
Here are two links I found, just in case you haven't seen them:
http://groups.msn.com/TheRSDNook/sgb.msnw
http://groups.msn.com/TheRSDNook/rsdtreatments.msnw
Hugs,
Stardust