I've been addicted to caffeine for years. The problem is it works the first few times you binge on it but then after that the only way you can get enough energy to get through the day is by drinking insane amounts that will make you feel jittery and anxious, and you will still feel tired but simply can't sleep because you feel so miserable. I love coke, that's fine I think. But it's just so easy to overdo it with energy drinks. I try to keep it to one or less a day now.
Caffeine is a weak stimulant. Anything you could get prescribed like adderall or provigil would work much better. Provigil doesn't cause the anxious effects either. I haven't tried adderall but I hear it works.
Get some fresh air. It will do you good.