What it sounds like to me is that you may have Thoracic Outlet Syndrome. The numbness and tremors and also discoloration comes with the TOS.

What might have happened with the block is that it did help the RSD but you are still dealing with the TOS.

You might go to the TOS forum and read what the people with it go through. I had surgery on my right side around 2000 to take out a rib. I still have the TOS, there is no cure for it but the surgery helped with a lot of the symptoms. It's one of the worst surgeries a person can go through though.

I hope it's not the case for you but it does sound like what you might have. Also TOS will not show up on any test. A lot of Drs. don't even believe in it.

Ada