I hope you feel better soon! I too used to have zero energy. I'm not sure if this worked for me or if it was due to something else but so far for a few weeks straight I've had a lot more energy after taking high dosage of B12 (5000mg), B6, B3 (Niacin). I read studies that high dosages of B6 & B3 significantly lowered depression. B12 is for energy. You know what they say. Vitamin Bs Beat Blues.