Hello, and sorry to hear you are having so much trouble with the dr's office. Hopefully, that will improve soon. I had to give up caffeine a few years ago due to heart palpitaitons and to keep from going totally bonkers, I mixed my coffee 1/2 decaf, 1/2 regular for a few days, and then slowly reversed it one teaspoon at a time, until I had it down to all caffeine. I know coke is a bit hard to do that with, but perhaps mixing iwth coke zero and following the same procedure might help.
I'm scheduled for surgery on 11/6 and am batteling a sinus infection that has gone into my chest. I've gotten a shot, high powered drugs and am on my preop liquid diet. Talk about a real bear at this house, I'm it. I'm praying that I can still have my surgery without having to move out the date.
best of luck on getting everything through this time.