I feel very week at a times with no strength. Also while getting up from sitting position, i feel dizzy. I'm facing same issue since childhood. Last year i went for yoga teacher training which happened to be quite intense. There this became to much for me. I took b12 shots there. After that i started feeling better. Its been an year now since i finished my course of b12 shots. I hv started feeling the similar kind of issue again. Please suggest. I have already given a sample for b12 test. While i was a kid, i got complete body test. Doctors said, its general weakness.