Hi, I'm here in search of help for my husband. His symptoms started with a mid back ache, inability to climb stairs, strange sensations (sensitivity to cold and heat) followed by tingling in hands and feet, then his balance started to go downhill. His GP did a lot of blood tests and said his Vitamin D was deficient and his B12 was a little low (340). His folate was 5.1 (GP said that was fine but I think it's a little low). He's now received 2 B12 injections (one per week) and is taking Vitamin D supplement. Symptoms seem to be worsening, though, and I'm worried. After reading all the posts here about getting daily or every other day loading injections, I was afraid that they just weren't enough so I bought some sublingual methylcobalamin as well as a folate supplement for him. The first one seemed to help within an hour or so (balance was better, tingling lessened) but the symptoms soon came right back. I'm wondering if this is truly a B12 deficiency or something else. Should he be getting more frequent loading doses? Any help is much appreciated!