hi mew. i'm sorry you have rsd. i have never had a lsb but i've had sympathetic nerve blocks in my neck for rsd that started in my wrist. they helped a little but not much. but everyone is different. if i were you i would get a second opinion maybe from another pm dr or neurologist. as for anything curing rsd, i have never heard of that either. as far as i know there is no cure yet for rsd but there is always a chance for remission. hopefully that will happen for you. sending soft hugs your way.