Hi Dubious,
I too don't really understand why your MD said that everyone he has treated as got better after a stallete ganglion block! He should know if he knows anything about RSD that what works for one person, doesn't work for another and that there is no treatment that will 'cure' RSD!!!!
I think some doctors like to make themselves sound good and as though they can make everyone better, rather than admitting that they wont be able to in all cases unfortunately. My Doctor used to be like that but has times gone by, he has realised that there isn't much more in the way of treatment options he can do for me unfortunately.
I'd talk to your MD and let him know that you are confused about what he said. I hope you get some answers soon - please let us know how things go!