A person should stay away from known triggers, especially during the well phase, as well as - get adequate sleep to prevent exhaustion - treat sinus problems or allergies - seek help on reducing stress and anxiety - avoid foods that trigger episodes or foods with additives A health care provider may refer people with cyclic vomiting syndrome and anxiety to a stress management specialist for relaxation therapy or other treatments. A health care provider may prescribe medications to prevent migraines for people with cyclic vomiting syndrome. 
How to prevent Cyclic Vomiting Syndrome ?