Green emesis on an empty stomach. did not feel nauseous before started vomiting but vomited four times in last hour?

Green emesis: The green is from bile. When did you eat last? Did you fall? eat somewhere new?Have abdominal pain? If persists > 2 hours at this rate ( 4x per hour) go to ER. If confused or blurred visions go right now.May be gastroenteritis, gallbladder, appendicitis, obstruction ( especially if Crohns) or if head trauma/ severe headache from increased pressure in head.