Energy drinks don't really give you energy -- they give you a sense of wakefulness. So even if you feel tired during the day or night and you believe the drinks aren't working that doesn't mean that they aren't keeping you from falling asleep. Caffeine is just going to keep you awake, which is not what you want right now.

If you need a little pep to focus in class, maybe cut it down to half a drink in the morning, but keep it at that! Keep this going for a week or two and see how you feel and sleep without the caffeine.

And everyone else in on top of it already: report the bullying.

I hope you feel better soon.