How much sleep are you getting Ashlyn? How much exercise?
Often times when we feel something isn't quite "right" with our bodies, we try to medicate it with synthetic sources... like energy shots.
the answer could very well be in your diet, your sleeping habits, your exercise regime...
Eat lots of fresh produce and drink water regularly - these things will help you keep your energy up, and will give your brain the nutrition it needs to focus better.
Try to make sure you're getting 7 hours of un-interupted sleep every night. If that's not going to happen, at least try to make sure that your sleeping space is without distraction. Turn off the phone, turn off the lights, no TV - these all disrupt our sleeping patterns.
Get moving! That 2:00 feeling the energy shots advertise they can eliminate, can just as easily be eliminated with a quick walk or even just some active stretching for a few minutes.