abstinence journal

For my addictions class, we are being asked to do a 30 day abstinence project. I am going to try and give up caffeine just to see how it goes. Yesterday was the official starting day, and I remembered after i was already done with my diet Dr. Pepper at lunch, it was the first and only caffeine of the day, and a huge step down from the four cups of coffee and a soda I had the day before. I was sleepy in class last night, and I found it harder to concentrate than normal. I spent part of the lecture reading about withdrawal instead of listening. It looks like withdrawal starts within 12-24 hours and peaks within 24-48 hours. I had a slight headache this morning (which would be at about 16 hours) and a pretty gnarly one right now (at 25 hours). My head is pounding, I am a little dizzy and I feel really run down. I am thinking maybe I should have tapered off a little more before trying this. If this headache sticks around tomorrow I am going to have a lot of trouble studying, and I don't really feel like I can afford to take the day off from my reading. At the same time I don't want to just give in and start over since i am already in the middle of the headache, and theoretically I should be over the worst of it by this time tomorrow.