Caffiene Addiction?

Ok, I think im addicted to caffeine.
I drink a cup or two -of coffee- in the morning and atleast two or three at night.
The thing is I get a really bad temper, headache and feel really tired and 'slow' when I dont drink it in the mornings. Because I have school I dont have a chance to drink some untill I get home. In the morning I was OK, I just had a pretty bad headache, by the end of the day I was extremely pissed off with everything, craving caffiene really bad and tired as all ****.
Any idea's on how to cut down on the coffee and caffienated drinks?
Thanks