I quit caffeine for like a week, and I can say that one thing I was really struck by was my lack of enthusiasm. It wasn't only that I didn't have the energy boost, but also that I wasn't interested in doing my work or the things I usually find interesting. I think it also releases dopamine.
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I guess that's normal regardless of whether it's coffee or any other addictive substance :) I've also heard some friends saying that they had headaches after quitting coffee for a few days.