I used to be on 2 caff pills a day, plus about a 2-liter of diet dr pep.
My last checkup, I admitted it to my doctor, and he tore me a new one.
I drink maybe 1/2 a 2-liter of soday daily now. Also I might chistle 1/4 a caff pill now and then (when I stay up til 4 am playing a show then back up at 7 am with the rugrat).
Caffeine is awesome - but you do need it to return to a baseline. It's a great feelig every morning - but you do become addicted. Since quitting it, life has improved greatly for me. Your blood vessels constrict when you take caffeine for years (I had taken it twice daily for over 2 years). I feel a lot better now that I"m off it. (for the most part - I still get 200 mg a day spread out.)