Suggest Remedy For Pain After Esophagus Procedure To Remove Scar

My question is about EGD w/rfa of esophagus. Tuesday I had this procedure done to remove scar tissue and hopefully get rid of low grade dysplasia I have not been able to eat or drink for several days I went back to ER to see if there was a problem with dehydration theirs not but still in pain and can t eat feels like alot of pressure build up under rib cage what can I do.