Welcome to NeuroTalk:

I wonder.... did you have B12 tested? Did you get the results and were they above 400pg/ml? Many doctors do not cover this base.

Here is a medical video on the problem, and what can happen if low B12 is ignored.
http://www.youtube.com/watch?v=BvEiz...ature=youtu.be

This our my B12 thread with details:
http://neurotalk.psychcentral.com/thread85103.html

Causes may be:
1) gluten intolerance
2) chronic use of acid blocking drugs (and some others)
3) pernicious anemia (usually inherited)
4)MTHFR DNA polymorphism (mutations) which result in a failure to methylate cobalamins in the diet, and folic acid. This leads to failure of the body to activate both vitamins, so that there is a loss of active B12 ...but the others may still be floating around for a while and show up in some testing.
5) Vegan lifestyle
6) exposure to nitrous oxide anesthetic

A hint may be found in a common CBC. If you show elevations or near upper limit of the MCV...(large red cells) this is an early sign of B12 deficiency. Often doctors ignore or gloss over this sign as well.

Please come to our Neuropathy forum for further discussions and support.
http://neurotalk.psychcentral.com/forum20.html