I had it done last year not fun but it the last step before surgery: we must be talking about your back correct:
I had them place the long needles into my neck on C-3 threw C7 I hope it works for you myself it did not work .I did flip the coin after a few years of trying everything
they had too offer.I had surgery last dec: 5,08 they removed to disc C-5 C-6 @ C-7
I will say the pain is about 60 percent better I still have one bad disc C-3,The Dr. stated to let it alone otherwise trying to turn the head left or right may be more problems
I have a small metal plate with 3 screws and yes on cold damp days it stiff but better then it use to be
GOOD LUCK HOPE IT WORKS WELL FOR YOU