Hello, Vomiting with yellow diarrhea with unbearable pain is indicative of the following: • Intestinal infection • Sub-acute intestinal infection This can be diagnosed by the following: • Tests of stool and blood • X-ray of the abdomen in standing position • Ultrasonography of the abdomen • If infection is present then obviously a course of an antibiotic and metronidazole helps the best • Take activated charcoal and pre and probiotics • Boiled and cooled water • Fresh homemade foods and beverages only • Electrolyte solution • Symptomatic treatment for gastritis, pain, and any other problems or symptoms. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. T Chandrakant