Pressure tightness and nausea in esophagus?

You can try an experiment to see if the problems are caused by acid reflux or insufficient gastric acid. For insufficient acid, you can try betaine HCL which is an over-the-counter acid supplement. Your can incrementally increase dosage and change the timing (usually taken at the end of a meal) to see if there is a beneficial effect. If this works, the problem is solved. If it doesn't work, try using Pepsid AC. If neither one works, then maybe its time for an endoscopy.