Caffine seems to be a trigger for a great many of us, and it is of course the obvious link between these drinks. I long since gave up the coke and settled on sparkling mineral water as my drink of choice - much healthier and just as refreshing when you get used to it.Are you in the states? If so do they still make Caffine free coke? I remember when I was over there four or five years ago they had it in some stores, but was it phased out like it has been here in the UK?If not, that might be worth a try so you don't miss coke.You should certainly try decaff coffee and see if that makes any difference.