Hi I'm a young 16 male and I haven't been sleeping so good, waking up multiple times in the middle of the night, I enjoy to workout but lately I haven't had the energy to that or even simple things like walking up stairs, when I stand up i get really light headed and my vision get so blurry I'm blind for a moment, I feel like I'm dragging extra weight around when I'm out, I can't eat in the morning like I used to be able to do, when I go get something to eat when I'm hungry the smell of food turns my stomach, please help me I don't know what's wrong...p.s. Also when I engage in sexual activities I can't get fully erected.....