What could be happening because of all these symptoms (dizziness, nausea, and more)?

im 14 weigh 113 and 5'6 everyday around the same time i get dizzy, tired, hungry, lightheaded, i start blacking out, i start feeling nauseous. The only thing that makes it better a little is when i eat something sweet or like fruit or something. I cannot make it better during the day because i am in school all day till 3 and i get home at 4. Please help me i don't know if i could be diabetic or hypoglycemic but diabetes does run in my family big time both sides my mom has it my grandfathers had it and a few of my uncles have it and so on down my family tree. Please help me before i mention this to my mom. THANKS! this means a lot to me for who answered