Sorry to hear that the nerve block didn't help you, Kate!

I agree with what the others said about now probably being a good time for you to try a different treatment seeing as though it looks like they are no longer working for you - theres no point in going through all of that if you aren't getting any relief!
I didn't have good results from my nerve blocks at all. The first one I had, my doctor injected directly into my RSD leg and it affected my coordination (I was left wheelchair bound for 13 months). My Doctor didn't know at the time unfortunately that you should never inject into an RSD limb. A few months later, I had to have an infected ingrown toenail removed on my RSD leg and my doctor did a ring block which caused me to develop really bad myoclonic spasms. My doctor told me that my nerve are REALLY 'wound up' and that I must stay away from any procedures to all of my RSD limbs if at all possible.
I hope you start feeling better soon and you are in my thoughts!