A hiatal hernia or eosinophilic esophagitis come to mind. The latter more likely if you have allergies (e.g. hay fever). You could get a proton pump inhibitor

A hiatal hernia or eosinophilic esophagitis come to mind. The latter more likely if you have allergies (e.g. hay fever). You could get a proton pump inhibitor to lower stomach acid production, and/or make sure not to eat too close to bed time. Have it checked out again, and consider getting a second opinion.