After living with severe neuropathy for 7 years, and having seen a wide variety of specialists there was one significant blood test that had not been done. I finally found a Neurologist who was determined to help me find out why I had the nerve pain as well as a lot of other symptoms, such as chronic fatigue, wide spread pain, general feeling unwell. The best I could describe was like getting the flu, without ever getting sick. It turned out my B12 was extremely deficient. I was diagnosed with Pernicious Anemia and it was later determined caused by autoimmune problems. I am unable to absorb B12 from food or oral vitamin supplements and now take regular B12 injections. It has taken 3 years to get my B12 numbers to a level the doctors are pleased with. Unfortunately long term B12 deficiency and pernicious anemia can cause permanent nerve damage. I would advise anyone like yourself suffering from neuropathic pain in legs and feet of unknown origin to ask you doctor(s) about B12 testing.