--oligcolonal bands--evidence of immunolglobulin proteins--which, when found, especially in spinal fluid, often point to some form of autoimmune disorder (most commonly MS, but also possibly lupus or neurosarcoidosis).

This is especially true when these immunoglobulins cannot also be detected in serum.

Take a look at:

http://en.wikipedia.org/wiki/Oligoclonal_band

Now, as regards some of the other stuff you've written about, while you have had some range of tests, it seems as if there's been a lack of serum tests for conditions that might cause neuropathy.

I've just been able to get into LizaJane's spreadhsets by following this link:

http://lizajane.org/