Caffeine Withdrawals?

I decided to stop drinking coffee. Yeah, cold turkey. Have I told you that my most favorite drink in the world is coffee??? I love coffee. Little did I know that you have to stop slowly.. Haha, not me. Never in a million years did I think I feel like an addict. I had about 7 cups during the week and at least 10 cups on the weekends. I have been drinking coffee since I was 14. Anyways so last Sunday I stopped and immediately the same day I got migraine headaches that I couldn't even cure with Motrin, fatigue, wanting to sleep all day (actually I did fall asleep minutes at my desk), depression, IRRITABILITY, you name it. Today is Thursday, 5 days later and it is the first day I am feeling normal again. I just can't believe that coffee could have such an affect on a human body. Just blown away by it.