I am lightheaded for months now

For almost seven months now I have been feeling light headded. I have almost no energy, I'm tired a lot, my eating habits change constantly (sometimes I won't stop eating or I can't eat or it's normal) I have a hard time paying attention to things, I get cold but the instant I put on a sweater or blanket I'm roasting, not sweating but I get hot. When I sit or stand still for a while it feels like I'm swaying but I know I'm not. I usually go to sleep around 10:30 or so and some weeks I get up at 5:00am and other weeks you have to drag me out of bed. When my eating habits are out of wack I feel starving but as soon as I start eating I feel full and sick to my stomach. I also feel dehydrated but I've been drinking nothing but water. I don't smoke and I've pretty much quit drinking because I feel like something bad will happen if I do. I've gone to the doctor and every test they ran on me came back normal. About two months ago my doctor said I might be depressed, I didn't believe her but once I researched it and realized I had almost every symptom I believed her and felt normal for about three weeks, but it's starting all over again. Has anyone else ever experienced this before or know what's wrong with me? I'm ready and willing to try and or do anything to feel normal again.