Why do i feel like this all the time? my drs dont know where to begin to test?

I'm 13 and for the past 3 1/2 -4 months, ive been feeling like I'm going to pass out! My vision goes blurry(at least every other day) and there's a weird ringing in my ears. I start to sway, and I can feel my knees buckling. I feel light headed and dizzy constantly. And I always have a migraine that is worse at certain points in the day! I haven't been able to sleep in at least 4 months(3-4 hours max every night) I shake like I'm withdrawing from drugs! (I'm only 13 and have never even thought of stuff like that :) normally it's just my hands, but sometimes my entire body just shakes. I always have a fever, normally averaging at 100. My heart pounds outta my chest at random points, and I can feel my stomach knott up. I'm always nauseas, and I have no appetite. I'm 5ft 4 and I weigh between 99-104. I'm always freezing, and I feel weak all the time! I'm on no medications. I can't ever concentrate, and I keep isolating myself from people! I think it's easier to be alone than to deal w people! I'm sad alot, and I yell at mysElf alot. I have very low self esteem, and I'm very shy. I'm used to enjoy music, and now I have no intrest in it. I dont care about school anymore, and I'm a straight a student. My teachers have seen me almost pass out and have called my mom and think it's because I'm anorexic. I do think I'm large, but I don't stave myself. I eat when I'm hungry. Idk what's wrong w me! If anyone can help pl ease do! Thanks! :)