Did you use/abuse caffeine/ritalin/..?
How does this compare with what you called truly insane?
This site is fun, btw: http://www.caffeineinformer.com/the-caffeine-database
http://www.sciencedirect.com/science/article/pii/S0301051107...
(Lots of other articles about the effect cited in https://en.wikipedia.org/wiki/Theanine too)
If you are using caffeine for energy, you probably should improve your diet first, instead, and make sure you get enough sleep (which I know can be hard in crunch mode, but it makes your awake time much more productive). I love my coffee as much as the next person, but using caffeine to drive my ability to work has never produced good effects.