Hi..... Welcome to healthcare magic... According to your complain you have problem of diarrhea and change a taste of your mouth that may be because of infection in digestive tract... H.pylori infection of stomach cause gastritis problem... Take a anti-diarrhea drugs like loparaminde... Drink a boiled filter water.. . Stay your body hydrated... Take a rice ,yogurt and light food which easy to digest... Avoid fatty food consuption... After taking this much care still symptoms are present than consult a gastroenterologist for further diagnosis.... Stool examination test is helpful to check a infection of bacteria or parasitic.... I hope my guidance helpful to you... Take care. Thank you.