If you have been supplementing sporadically with B12, your level might show higher than it was at its lowest point. One needs to get the level up into upper range, and keep it there... and over time many to all of the symptoms may resolve. For me, lots of things improved within a couple of months, but other things slowly improved over a number of years.
Some more excerpts on neuropathy in gluten sensitivity:
Cognitive decline can also be caused by both gluten sensitivity and B12 deficiency:
http://jccglutenfree.googlepages.com...cline-dementia