[tbirdz]

I was never a huge caffeine user, my peak was maybe 3 or 4 cans of coke zero a day. Since I quit I've seen my level of general anxiety go down, my moods are more stabler (like less feelings of irritability, stress, feeling overwhelmed), and I feel like my sleep has improved. I haven't noticed any real change in my performance after quitting. Maybe I don't feel as "sharp", but I'm still getting the same amount of things done at the same quality as before.

One thing to note is that once you quit you will not be able to really use caffeine effectively at the same level you are currently using it.

I recently had some caffeine, and after being off it for so long, it was actually very unpleasant. I felt like a cpu that got overclocked and was overheating. It didn't really make me any more productive, it just made feel like wow I'm really up right now, too far up and I want to be back to normal, but I can't until the caffeine passes through my system. And just that feeling of being trapped in the "high" and being unable to get out was very disturbing to me personally.

[bradleyjg]

You became dishabituated. Likely you could get more of the effects you remember with a smaller dose.