I have gastroparesis related to type 2 diabetes diagnosed after a gastric emptying study - GI nerves and muscles don't work like they used to so stuff doesn't move through my system efficiently and sometimes feel like it's stuck from stomach to bowel. When I have a gastroparesis flare I get nauseated and gag and have trouble swallowing and occasionally what feels like acid reflux. When they did a colonoscopy a year ago and an esophageal scope the colonoscopy was ok but they found mild narrowing of my esophagus and stretched it slightly. That helped a lot but sometimes I occasionally experience trouble swallowing which I relate to slow emptying of the stomach. What you describe sounds like gastroparesis and acid reflux but I'm not a dr so maybe you can ask your medical provider about this and if that doesn't help perhaps seek another opinion? Hope you find some relief soon!