Had bronchitis finished antibiotics, cough syrup etc. now tummy upset. cramps. loose stool. eat healthy. no known allergy. how to make tummy happy?

H pylori test: for a pathogenic bacteria that colonizes the gastric tissue. If present, this would explain your gastric symptoms and hyperacidity. Loose stools could be from antibiotics. Your doctor can do a simple 5 minute breath test for H pylori. Avoid dairy and salad to help diarrhea. Some Kaopectate (kaolin and pectin) might alleviate diarrhea. Hope this helps.