Diet Coke?!?!

I am 10 months out and I have lost 124 pounds. I know that we are not suppose to have carbonation but I for some reason cant stop I have tried with no succuss. I do not drink it out of the bottle anymore and I do limit myself and I am getting in all my water. I did talk to my dr and they said that it was really a theory about it stretching out your stomach but it might make bad gas pains. Has anyone else heard this. Usually if I put it over ice and let the fizz go out I am ok. But I am wondering is the anyone else that had heard this or does this. Also I really dont dump/ Sugar does not do it carbs do not do it fat does not do it. I just hope this does not mess me up down the road. I still want to loss 55 more pounds. I have gone from 347 to 224 I want to be at 165=170. (I know that sounds like alot but I am pretty tall. Well any advice will help just dont yell at me I get enough of that from all my skinny relatives!!!