HI Well come to HCM I really appreciate your concern, abdomen pain with diarrhea and vomiting could be due to some infection beside the symptomatic pain medicine it can also be given tried with antibiotic like Ciprofloxacin with Tinidazole twice in day for four days and for vomiting Tab Ondansetron sub lingual route can be tried, in differentia diagnosis condition may needs some investigations if the symptoms remains as it is, over all the underlying cause of the symptom matters the great, hope this information helps.