Not sure what to do, I'm a 19 year old female who always been healthy till now, I'm tired all the time even after 8 hours of sleep, I try working out to boost energy levels but I find myself too tired to do anything now, I also get headaches and feel lightheaded, I have fainted a few times when I get really light headed and hot and dizzy. I've gotten blood tests done and the only thing that came up was a low white blood cell count. Please help for any solutions.