Welcome to NeuroTalk:

If you are using magnesium in the form of OXIDE...this we know now is not absorbed. You have to have a better type.
SlowMag is one, and any other chelate with citrate, gluconate, glycinate, malate, etc.

You really should get B12 measured, and get the numbers. The suggested low today is 400pg/ml, but labs still report, below that as "normal".

Here is my B12 thread.... please watch the YouTube video also in the first post.
http://neurotalk.psychcentral.com/thread85103.html

Low D is also very common in the US.. so have them test that too.
We at PN find that all 3 of these may cause various neuropathy symptoms when low in the body.

Up to 70% of people are below the RDA in daily consumption of magnesium, and up to 70% are low in D3, and up to 40% low in B12 today. I call them now The Big Three.

Here is the SlowMag website....
http://www.slowmag.com/

You can also try using the new lotion by Morton. Morton Epsom Lotion, which is at WalMart now and newly at Walgreen's. It is also online at Amazon. Some magnesium is absorbed from the lotion, so if you choose this and use every day, you may not need oral types at all.