@rkm4,
Back injuries are really really tricky.
The classic characteristic of a pinched nerve is the pain that irradiates or travels threw the affected nerveĀ“s common anathomical pathway. The classic example is the ciatic nerve compression. A pain that starts on the buttocks and runs down threw the posterior surface of the thigh and can end on the leg or even on the feet.
There are studies that can confirm the prescence of a lesion to a nerve. I recommend you to seek help with a doctor specialized on physical theraphy and rehabilitation.
Must of the time the intial injury, a fall or a car accident, just detonate a vicious circle of pain-bad posture-pain which is the real cause for a long standing back pain illness.
Yoga, relaxation therapies and core muscles training can help alot.
Theres no need to suffer a pain forever.