Thank for asking to HCM
I really appreciate your concern the given history is suggestive of intestinal infection and the most probable organism would be protozoa, if I would be your doctor then I would treat you with the following medicine,
1) Tab Metronidazole
400 mg twice in day for seven days
2) Tab Dicylomine three times in day
3) Tab Omeprazole
40 mg once in day
hope this information helps you have a nice day.