That is what happened to me first time around. I was origionally fused C6-7. I got worse instead of better, and wound up having the C3-7. I don't recommend it. In my case I reversed the curve of my spine, not just cord problems. It was awful surgery, it hurt!!!!! Yes old hardware taken out, whole thing done.
You are getting more trouble at C5-6? correct?. Does your mri say "SEVERE"?
Did your doc give a reason why the rest of them would have to be done to correct just that one giving you trouble? I would hate for you to have to go through all that, if they could just re-do the one. None of this is fun is it.....
I have good days, and not so good days. I sure wish you could be spared more pain. Have you gotten more than one opinion on it? ginnie