I had a Selective Nerve Block Injection in my C7 nerver just over 48 hours ago and I have noticed no improvement at all. I know they said it would be 3-5 before I would know if it worked but I am still getting all the numbness and tingling in my left arm and pain in my shoulder blade and neck, just like before the injection. They also said it could get worse before it got better. Have any of you had success with these and if so how long before you noticed any improvements? I am very lucky in the fact that I have had no side effects(cross my fingers)just the same pain I had before...so far. Am I being impatient??