Oh ya. It actually aggravates gerd The caffeine and the carbonation of a diet coke. I do think eliminating caffeine can help you. I had to do this with coffee. And I'd already given up pop. But when I have it, I'm very uncomfortable. Losing some weight really helped me overall. Is this something that might be beneficial to you as well? (not sure of your weight, so that's why I'm asking). Have you tried an antacid like Pepcid or Tagamet? You might do so to see if it gives you any relief. Another avenue is the chemicals in diet coke. I personally can't do diet anything as I get migraines from the chemicals. So, you may react when you have more than usual as well. I'd consider maybe giving that up. I hated water for the longest time but it began to taste good when I had given up the other flavored drinks I was used to. :>)) Hope you feel better soon.