--you're doing pretty much what you should be doing.

The point is, you have a neuropathy problem somewhat different, and apparently less bodily systemic, than most people here have. Yours seems pretty directly traceable to mechanical/compressive issues with the spine and the nerve roots. That is technically a neuropathy (more accurately termed a radiculopathy), but not like one caused by diabetes, toxicity, autoimmunity, and the like.

If you are getting symptoms above the level of the injury (you mentioned a few intermittent ones) that might necessitate a scan higher up--perhaps an MRI of the cervical spine. Problems in that area can cause symptoms in the neck and arms, though depending if the spinal cord is involved symptoms may also appear lower. (Weightlifters are notorious for cervical as well as lumbosacral spine problems.)

It probably wouldn't be a bad idea to post to the Spinal Disorders forum as well (you could just copy your post) to see what those people might suggest:

http://neurotalk.psychcentral.com/forum22.html

Of course, if nothing shows up on scans, then a more systemic investigation might be called for. Nothing stops any of us from being "co-morbid".