Trapped Nerve: You didn't mention the symptoms you're feeling, or the location. Your fears may be confirmed, the cause in fact may be originating from a spinal problem. But it might be neuromuscular instead. In fact, the AMA reports that the vast majority of back, leg, arm pain is due to issues within soft tissue (the muscles).

For instance, an impinged nerve of the brachial plexus can cause tingling, even numbness in the effected arm and shoulder (it can even mimic carpal tunnel syndrome). From its origins in the cervical spine, the brachial plexus has to pass through or over or under the scalenes, the pectoralis minor and into the armpit, where it can be further impinged by the muscles of the arms.
If the problem is in your feet or legs, the piriformis, a small muscle located beneath your gluteus muscles, can be pinching the sciatic nerve, and causing what is euphemistically called "sciatica."

If the cause of your problem is in fact neuromuscular, a few sessions with a massage therapist should straighten you right out.

However, because your symptoms may have arisen due to a bulging spinal disk, etc, you definitely need to see a doctor before considering a visit to a massage therapist. If your doctor is agreeable, ask for a referral to a local massage therapist who is certified in neuromuscular therapy.