First of all ... Hello and Welcome to Neurotalk!!
I am so sorry to hear that you also suffer from RSD

. I have RSD in my left leg and right arm, I developed it when I was 12 years old, I am now 13. I had a Sympathetic nerve block when I was initially diagnosed with RSD and my doctor injected directly into the leg which has RSD. Unfortunately, I suffered from complications and ended up wheelchair bound for 13 months. I am only just starting to get out of the wheelchair now. It was only after I had the block that my mum went researching on the internet and found an article that states that you should NEVER inject directly into a limb that has RSD unless it's absolutely crucial. My PM doctor said he didn't know that at the time and he wont do any more nerve blocks because of it now.
I don't want to scare you in any means - I just wanted to make you aware that you shouldn't inject into an RSD limb in case that is what your doctor is wanting to do.
I wish you the very best of luck and if you need someone to talk to, I am here.
Alison