Just because you have carpal tunnel doesn't mean you don't also have a back problem. I'm not sure I understand how carpal tunnel, which is a wrist problem, would affect all these other areas, but that doesn't mean you don't have it. I'm also not sure I understand the gabapentin, it might help with nerve pain but won't help with numbness. I would think for this stuff you'd want to see an orthopedic surgeon.