Pay attention to how you sit at work or school. Does the front of the chair cut into you thighs? Is your back sufficiently supported? Things like that. If your body is working hard just to sit, of course it is going to be exhausted the rest of the day.
Honey, how long has this been going on? Have you been tested for mono, a B12 deficiency, chronic fatigue syndrome? There are sooo many things it could possibly be. You probably need a really good Comprehensive Blood Panel work-up, not just a basic one. I hope you start feeling better soon, sweetie.
a rolling stone gathers no moss. get up early exercise. gets the blood going feel better drink plenty water to flush your system. toxic build up can make you sluggish. NO ENERGY DRINKS they are a rush that drops you. Then you build a tolerance and makes you feel worse than before you started drinking them.(like doing cocain)