You're real sensitive to sugar and/or caffeine aren't you?
I'm rather desensitized to energy drinks. One time at a LAN party I drank about 5 cans of Monster in a matter of 2-3 hours. Heh, and the label says you should only drink 1-2 cans every 24 hours.
You should try Redline though. I drank half a bottle (they're pretty small bottles) and within half an hour I already felt a small rush. It's probably one of the most intense energy drinks I've ever had.