A shot once a month is not doing much for you.

You can raise your levels faster and more efficiently with
oral activated methylcobalamin. Within 3 mos you can be over 1000.

Since this is faster, and very inexpensive, I'd do that. The shots are typically cyano form and some people cannot convert/activate it to the methyl which is what the body uses.

Methylcobalamin is now appearing in stores, Walgreen's has one and Costco now. I'd suggest you do 5mg a day on an empty stomach and get tested in 3 mos.

Here is a video on this subject:
http://www.youtube.co/watch?v=BvEizy...ature=youtu.be

and my thread with more explanations and medical references:
http://neurotalk.psychcentral.com/thread85103.html

Waiting around for B12 to work, is not working for you.
You may have the genetic error in MTHFR and cannot convert
B12 and folate properly, so your nerves suffer. There is a DNA
test for this, from your doctor, or online at 23andMe. If you have this error, the cyanocobalamin shots will not work for you and you will continue to deteriorate.

This link explains what doctors SHOULD be doing for patients:
http://www.aafp.org/afp/2003/0301/p979.html

One injection a month does NOT work for everyone equally.