My nother age 57 is having issue with nerves. While walking for even a small distance feel tired,pain in shoulder blade arms,sometimw legs nerve. Feeling of tremor from inside after walking. Vitamin b12 is around 180. She us diabetic from 7 years,hba1c is around 6.0. Could it be due to vitamin low or neuropathy? Feeling of tiredness just walking a short distance than nerver pain,some tremor from inside and after doing rest things get ok.