--stand for anti-nuclear antibody, which is the standard rheumatological test for a number of vascular/connective tissue autoimmune diseases such as Lupus, Bechet's, Sjogren's, Polyarteritis Nodosa, and others. Often the pattern of the antibody as well as its presence can help identify the condition, but this is hardly an exact science, and there are people who don't show any pattern, or a pattern not consonant with many "standard" desciptions of symptoms. And, there are certainly other antibodies that can cause disease besides the ANA, inclduing many neuronal ones that directly attack nerve.

Cycelops on these boards can speak to these in great detail and there is also good info on these at both the Washington University Neuromuscular site:

http://neuromuscular.wustl.edu/over/labdis.html#Ab

http://neuromuscular.wustl.edu/nother/autoantibody.html

http://neuromuscular.wustl.edu/antib...tml#vasculitis

And the Liza Jane spreadsheets, which are also good for suggesting tests and tracking results over time:

www.lizajane.org


And, I agree, that B12 is too low.

You may have multiple things going on, with that ANA present. Have you been tested for celiac/gluten sensitivity? Or toxins?