I see Darlene has already given you the link to the neuropathy forum.

Take a look especiay at the Useful Sites "stickies" at the top of the forum that contain info about types of neuropathies, testing, and the like. There are over 200 known causes of neuropathy, and probably at least that many still unknown, but it's very important to get proper testing, and in many people's experience, that's very hard to do, as most neuros are just not familiar with the breadth of the field.

For instance, a serum B12 test may not tell you whether you have a B12 deficiency at the cellular level--homocysteine and MMA testing is better at spotting that, but many doctors are way out of date on the issue.

Make sure you take a look especially at the Liza Jane speadsheets for neurological testing at www.lizajane.org--a good way to not only suggest tests to doctors but to track results over time.