I wonder if my carpal-tunnel-like symptoms are also related to my crappy memory - since they're both seemingly neurological: my hands go numb every night, sometimes 10 times, no matter what position they are in. I think my B levels were tested when I asked my doctor to check a bunch of things including my vitamin D level (partly because of the hand numbness) - but I'll look for the labwork and check. Vitamin D supplements and sunlight haven't helped the numbness, but they did help my energy. I take magnesium here and there, but I'm going to start taking it daily.
I try very hard to avoid glutenings and cc. I think my last glutening was from 'gluten free' honey nut Chex. Sigh.
I agree that you should get some sublingual B12 supplements. B12 is one that it can take some time for the labs to show the deficiency and some of the ranges are still set too low. It is a water soluable vitamin so you can't take too much as your body will simply excrete the excess. Give the sublinguals a try for at least a couple of months.