I had sympathectomies several months after TOS surgery which helped tremendously,I think
I had them on T1 and T2.
I do use blocks as a pain management tool , mostly on my lower body - my feet a newer addition to my personal RSD family
I still get good relief from Lumbar blocks- much beter than upper body blocks.
Occasionaly I get a little flared from them but nothing I can't handle and the relief far outweighs the negative side effects of the procedure.

I would definitely suggest trying them out.
If they work for you they can be a great source of pain relief and
they can arrest the progress of this condition.

Good Luck

GnP