I am SO sorry to hear that you are in so much pain and hope and pray that you will find something that will help you soon!! Please don't give up hope just yet, there are still many drugs and treatments out there that can help you and reduce your pain and other symptoms!!
I have only had one nerve block and I didn't respond very well to it at all. I developed some pretty serious complications which ment I was left in a wheelchair for 13 months. It took ages for my doctor to try and awknowladge the problem but eventually he said that the nerve block DID cause that problem and in my case, I should never have any more nerve blocks. After I had my nerve block, my mum found an article on the internet that stated that you should NEVER inject directly into an RSD limb unless you absolutely have to!!!! I just wondered whether your doctor injected into your RSD limb?? If he did, I would definitely speak to him about it - my doctor told me he was one of the best doctors in our area for treating RSD but he had never read that article, it was only when we showed it him that he finally believed us and he later said that he would never do that again to any of his other patients.
I am keeping you in my thoughts and prayers and hope that you get some much needed answers and relief soon!!