My concern is with why you keep going back to caffeine after you've quit. Is it because you feel you need it? If you are getting enough good quality sleep, eating reasonably well and such, then you shouldn't really feel the need to reach for the coffee.
If you still do, though, you might want to think about seeing a doctor. Sleep apnea can cause serious daytime drowsiness, and so can depression and other medical conditions, most of which are treatable. Once you get clear of the coffee, this time if you feel like you want to start reaching for it again, ask yourself why. Are you feeling drowsy? Lethargic? Lack of enthusiasm? After taking stock of your symptoms, then see the doc and report them to him.
One thing I've noticed is that I used to get REALLY drowsy in the few hours after lunch. When I was trying a low-carb diet, I never felt drowsy after lunch. Now, I try to eat a low-carb lunch every day because otherwise I have to fight to stay awake all afternoon. I've heard other people say this as well--Scott Adams, creator of the Dilbert comic, said this on his blog.
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