How are you? Were there other symptoms present like loose watery stool? Abdominal pain and vomiting may suggest possible acute gastroenteritis, food poisoning or other gastrointestinal issues like gastritis. If eating mixed vegetables triggers an attack, try to avoid this. Try to hydrate by drinking plenty of fluids to prevent dehydration. If it persists, have this checked by your doctor for proper evaluation. Take care and do keep us posted.