For the past several weeks, I’ve been so low on energy and sleeping all the time and hardly eating, but now, all of a sudden, my body decided to kick into overdrive and now I have more energy than I actually know what to do with. I just want to run around in circles for hours and jump around, I feel so hyper. Yet for some reason, my stomach hurts like I just ate a ton of food, even though I didn’t. EDIT: And now I feel like I might throw up.
But it's never been like this before...
EDIT: Scratch that, there was that time at Christmas when I was high from marathoning Legend of Korra, listening to my favorite band, and eating insane amounts of coconut cream pie.
If you're in your teens, hormonal changes can still be playing a big part in your body. A number of other factors can also wreak havoc on those hormones, like stress (it sounds like you may have a bit of it) and inconsistent eating habits.
I do believe it's probably time to see a physician. While the complaints you have could be just hormone fluctuation or it could be something more serious like bipolar. Either way it's worth having someone take a look.