Hi and welcome to HCM.
This is common when travelling to undeveloped countries. Probbaly this is just a viral enterocolitis
or food poisoning
.Also there can be any other viral infection(even respiratory) which cause abdominal discomfort The most important thing is to be well hydrated so drink lot water and teas and eat easier food.Also watch carefully what you eat. I doubt this is bacterial infection so there is no need for antibiotics,but if fever
occurs or you notice blood in the stool you should visit doctor. WIsh you good health.