It could easily be GERD as your doctor suggested, or as API has suggested above, it could just as easily be the anxiety affecting your appetite. If you can, try to work past this and not give it so much attention. I feel the more attention you give it, the more it will bother you. I think we all focus on things that we feel are a little "off" and then it snowballs from there. You mentioned your doctor feels it's GERD.....did he have any suggestions for you to help with some of the symptoms of GERD?