A useful keyword in this is Helicobacter pylori. Apparently a huge percentage of people have it, especially in developing countries but not limited to them, and it is known to cause a lot of problems though there is debate about possible benefits of it. https://en.wikipedia.org/wiki/Helicobacter_pylori There is a sort of cure for it involving proton pump inhibitors and antibiotics. After which, your stomach feels a t…
Do you mean you diagnosed this yourself, had it confirmed by a medical professional and received treatment? Or you self-treated it somehow?