As for an endoscopy, that will only find a stomach ulcer
, not a duodenal ulcer
-- as I said, having had one, they're hard to find. They never found mine, but it was bleeding and it was diagnosed only because I responded to antacids. Personally, now I wouldn't take them unless it was an emergency, because, as I said, they end up increasing the production of acid. That being said, some on this website are intensely hostile to natural supplements, some to medications, and some in the middle.