Bless you, Tom. I have a suggestion for you, and unfortunately there's no way to tell if it might be the ticket for you until you try it. I have done this, having learned of it just a few weeks ago. The pyloric valve, at the top of the stomach, is sensitive to acid. It pinches closed when exposed to acid, which it will be exposed to shortly after you have consumed anything substantial that activates acid production. At least, that's what the story is. So, if you find yourself belching acid-fumed gas, and having indigestion, you're in two deficits: a pyloric valve that can't/won't shut and insufficient acid to make it do so if it wants to shut. Further, you may need a reconfiguration of your gut flora...all the microbiota that a healthy human has all the way down the alimentary tract, top to bottom. Taking pro-biotics, enriched yogurt, fermented vegetables like sauerkraut and kimchi, really helps.
But, to get help right quick for belching and indigestion, there's something I have begun to do and it works! Swallow about a full tbsp of apple cider vinegar. What!?!?! When I have acid indigestion?!? Gimme a break! Yes, when you have belching and acid indigestion, take MORE acid. Apple cider vinegar is highly acidic, and rather unpleasant to take neat. But very soon after you take it, your pyloric valve will shut and you'll find yourself in bliss. You may still belch once or twice, but you won't have to put off going to bed, for example, while you let your stomach calm down...often hours later. You'll be good to go inside of 90 minutes.

You want to avoid exposing the higher esophagus to stomach acid. All sorts of bad things can happen, including cancer...apparently. So, as soon as you begin the cycle of belching and grimacing with acid reflux, go get that apple cider vinegar and knock 'er back. Not particularly fun, but what comes inside of ten minutes is a lot better experience.