Auricular Neurostimulation for Cyclic Vomiting Syndrome

Inclusion Criteria: * Meeting Rome IV Pediatric or Adult criteria for Cyclic Vomiting Syndrome (CVS) * Concurrent abdominal pain with CVS cycle * English-speaking * Lack of other explanation for symptoms * Either predictable, 'calendar-timed' episodes or prodromal symptoms for 12-24 hours that are predictive of episodes onset Exclusion Criteria: * Medically complex and/or suffering from medical condition that may explain symptoms * Taking a medication that may explain symptoms * Significant developmental delays * Patients treated with a new drug affecting the central nervous system within one week of enrollment * Infection or severe dermatological condition of ear * Stable vital signs * No currently implanted electrical device * For adults (and adolescents as applicable): pregnancy, severe cardiopulmonary disease, concurrent chronic marijuana use (\>2 times/month over past 6 months prior to enrollment)