pylori can persist, even after treatment, and can cause ALL SORTS of digestive upset. Sometimes tests for it can come up
negative, and then later come up
postive, which is why to get retested periodically, particularly since you've been positive before. Google a few websites about that problem, so you'll be better informed, because it takes a while to get rid of it, I don't care what your doc says. Sometimes different antibiotics have to be used, it is a very stubborn infection.