Can't even go one day without caffeine

So I was going to try giving up on caffeine for a while. Mostly so when I used it before a race, it would have a super effect. I have managed to quite drinking a 6 pack or so of diet soda a day, but I skipped the cup of coffee yesterday morning. Yah, that didn't work out as planned, It's 11am and I had to go make a pot of coffee, couldn't take it anymore.