I'm so sorry to hear that you have been diagnosed with both RSD and MS

!! I really hope you find something that can help you and relieve some of your symptoms real soon and I am keeping you in my thoughts and prayers!!
I have read the article that Mike posted before and it really made me wonder whether or not there is a link between RSD and MS. My nanan had Progressive MS and had a lot of the symptoms that I have so it has always been at the back of both mine and my mums mind - although no doctor has ever tested for it and just put the symptoms down to the RSD.
My nanan had the pins and needles and tingling that you are having also. Her Neurologist told my mum and grandad that it was one of the commonist signs of MS and that is usually the symptom that makes Doctors check for it. I hasve the tingling also but my doctor just said it was nerve damage from the RSD.
I really wish I could help you more but I know there is nothing I can do unfortunately. Just know that if you have any questions about my nanans MS, I am here for you and will be happy to help if I can!! My nanan passed away 7 years ago now unfortutnately but I can still remember a lot about what she went through!
Take care - i'm thinking about you and keep us updated when you can!!