Cyclical vomiting (Periodic Syndrome Commonly Precusrcors of Migrane)

1. At least 5 attacks fulfilling criteria B and C
2. Episodic attacks, stereotypical in the individual patient, of intense nausea and vomiting lasting from 1 hour to 5 days
3. Vomiting during attacks occurs at least 4 times/hour for at least 1 hour
4. Symptom-free between attacks
5. Not attributed to another disorder