B12 can get elevated from what is called a dysbiosis in the bowel.
When certain organisms start to proliferate, sometimes after antibiotic treatments (usually oral), those organisms can make B12 and you absorb it that way.
http://www.cnelm.co.uk/Nutprac/vol9i...LevsB12.GM.pdf
There are other disease states that raise cobalamin when no supplements are taken:
http://www.ncbi.nlm.nih.gov/pubmed/14636871
http://www.ncbi.nlm.nih.gov/pubmed/17981373
I do hope for your sake that the resurgence of your symptoms are not related to a malignancy.... this type of PN is called paraneoplastic.
__________________
All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
************************************
.
Weezie looking at petunias 8.25.2017
****************************
These forums are for mutual support and information sharing only. The forums are not a substitute for medical advice, diagnosis or treatment provided by a qualified health care provider. Always consult your doctor before trying anything you read here.