If you are constipated for a week, could this cause severe diarrhea and vomiting?

People with irritable bowel syndrome can go from constipation to diarrhea but vomiting is unusual. If your intestinal situation doesn't normalize, get evaluated by your physician or a gastroenterologist. Any appropriate testing will be ordered. If vomiting persists or if severe abdominal cramping or distension occurs,proceed to the ER for prompt evaluation.