My B12 was 4,000 and I had only been taking a cheap B vitamin from walmart with the Colobamin or whatever, lol, kind of B12 in it. I dunno why it is so high.

As far as nerve healing, I have been looking for that answer myself, as my symptoms have taken a turn for the worse the last 2 weeks and I wonder if it is healing, hoping, or just getting worse. Everything I have read says when healing begins it feels awful and can last a long time as it takes awhile for nerves to heal. The most common symptom is itching and phantom pains.