Whether or not there is nerve involvement can be assessed by a combination of examination, exact symptoms, MRI, and a study called EMG/NCS which tests how nerves conduct electricity and how muscles respond. If a nerve injury is identified, sometimes medications to help
neuropathic pain (such as neurontin, lyrica, elavil, effexor, etc) can help significantly.
It sounds like you've had evaluations with multiple physicians with many procedures.