Quitting Coke

Monday was the day I had my last Coke fix. Coke-Cola fix that is.
I've been having terrible headaches since Tuesday noon. I can't believe it. How can I've been doing this to my body? I used to drink about 1.5 to 2 lts. and recently about 1 lt. a day. All those calories, all that sugar and all that caffeine. I just hate Coke Cola right now.
After this headaches, I'd be crazy if ever picked up Coke again