Welcome to NeuroTalk:

Sometimes the answer is something that doctors really don't understand, yet today.

http://www.youtube.com/watch?v=BvEiz...ature=youtu.be

This new video shows real people who have serious issues, all stemming from low B12 levels. One is child. One is a doctor who almost died.

If your son had B12 testing and it was "normal"... be advised that old lab ranges still report 200pg/ml as "normal" when it is really severely low. 400pg/ml is now the real acceptable level to be low normal. So each patient needs to double check this on their own.

If your son has not had methylation testing to see if he has the DNA methylation error called MTHFR, then he has not been completely evaluated. 10-30% of US population have this error, which blocks proper use of B12 and folic acid. (they cannot be activated in the body called methylated).

This is just a basic starting point. Degeneration of nerves can occur with low B12 levels. So you need to look at that more closely. 10 is pretty young for autonomic neuropathy. We have some patients here on our PN forum. So please do visit.
http://neurotalk.psychcentral.com/forum20.html