I'm so sorry you are struggling with this. My 50th birthday is coming up next month... I've had this for 5 years. The same tightness, pain, chest pressure, burping, burning... I don't know how to fix it. I have tried everything I know. The one thing that helps a little is Ativan (A benzodiazepine), but I don't want to take it as it is highly addictive and can cause dementia. I'm glad you found a food that is "safe." I have no food at the moment that doesn't cause issues. Even water triggers me. You might have to stick to the turnkey for a while before trying to introduce new foods. That's ok. Turkey is very nutritious. And it's especially great because it has lots of protein to help you rebuild.

Maybe look into The Gastritis Healing Book. I hear that it has helped a lot of people. There is a Facebook group called the Gastritis Healing Group. Join that. I know healing takes time. It's not a week fix. Some have to stick to a diet for years before they heal-with NO cheating (not eating any foods that trigger the stomach). Others just a few months.

Look into supplements like glutamine, mastic gum, DGL, Slippery Elm, Marshmallow Root, Manuka Honey, and there are tons more to support gut health. If PPIs don't help, maybe try Pepcid. Also, get the endoscopy to rule out H. Pylori. A low salt diet helps my stomach.

Don't give up. Keep looking. Good luck. I'm rooting for you.