35yr old and i have no energy to get through the day. i have a slow metabolism, i gain weight fast... what kind of vitamins could help?

Vit. E for Exercise.: While lack of energy can be due to physical or mental exhaustion, it can signal depression for which you should seek help from a professional , sooner rather than later. In the meantime maintains healthier diet and regular exercise, preferably in a gymnasium with paid membership at least 4-5 times weekly would do wonders for you.