My doc said no to carbonation also. I was a diet coke addict. I gave it up on Saturday, December 6, 2008 at 8:52 pm. It was my last one and I haven't looked back. I used to have one every morning and more throughout the day.
Immediately I started sleeping better and I used to quit caffiene by 5 pm, so I didn't really think it effected me. I am not bloated anymore either.
This has been one of the many things I have had to give up, but I know I am better for it. If I can give up my diet coke, I can do anything and I will be a weight loss success story!