--is certainly possible, but if this has been going on such a long time, have you had any types of extensive work-ups that might provide clues?

It would seem that if you suspect spinal issues to be a the root of the symptoms, some MRI's of the spine would be in order.

Neurological symptoms that stem from spinal/nerve root compromise can be exactly mimicked by those that come from more systemic origins (this is the reason that searches for causes of these is often rather long and expensive--and not always fruitful).

Often (and you might have seen these on the Braintalk forums as well), we refer people to the LizaJane spreadsheets--www.lizajane.org--to examine the very long list of tests that could be considered for neurologic symptoms (it's also a good way to track test results over time and look for patterns). You may want to look those over, and also look over our list of serologic and other tests for neuropathy:

http://neurotalk.psychcentral.com/thread177.html

--to see what's been done and what may have been left out.