My Son Burnt His Esophagos. He Ate Hot Food A

My son burnt his esophagos. He ate hot food a few days ago. In lots of pain , can't eat. What to do? My doctor never called back today . We went to a clinic doctor. Got some medicine to help with acid, etc. What can be used for pain? We tried pepto bismol?Nothing. He can't even eat pudding? He's 15.