Have you talked to the doctor about the concern? Do you have another doctor like neurologist you could call and ask? I have RSD and PN so don't do any type of injections but did pre dx. I did not find them helpful and things like blocks made me worse because they stirred up my nerves rather then settled them. I have a question often with these injections if you get relief it is short term I thought? So then you have to get more?