Could it be possible that my B12 levels are high because the body isn't absorbing B12 for some reason? If so, what could possibly cause that to happen? Is there a specific test that can be done to check B12 absorption rate?

I'll stop the B-complex and just take B12 as suggested and see what happens.
The burning in my feet seems to be less now, but my right leg is still weaker than the left.

Thanks for all your help and support! 8-)