I have quit caffeine several times. I love the taste of coffee and tea, but I become dependent on caffeine very quickly, and have to keep upping the dose just to feel normal. Eventually I don’t feel human until half way through the day and there is no amount of caffeine that will give me energy. The withdrawal headaches are too excruciating for me to bear so I found a way to effectively wean myself off of caffeine using caffeine pills. Once you figure out how much caffeine you need to feel ok, you know your actual dose and can simply take a little less each day. For me that means a week or two of feeling a little groggy, but avoiding the headaches. I’m not a morning person, so I’ll never feel perky in the morning but I at least feel human.