Well-being in IBS: Strengths and Happiness (WISH) 2.0

Inclusion Criteria: * IBS Diagnosis: Adult patients with an IBS diagnosis meeting standardized Rome IV diagnostic criteria. * Language and communication: English fluency and access to a phone. Exclusion Criteria: * Presence of inflammatory bowel disease or other structural/biochemical primary gastrointestinal illness that better explains IBS-like symptoms: As reported by the patient, their physician, and/or documented in the medical record. * Severe psychiatric illness: Current manic episode, psychosis, or active substance use disorder diagnosed via the Mini International Neuropsychiatric Interview (MINI). * Cognitive impairment: Assessed using a six-item cognitive screen developed for research. * Presence of atrial fibrillation or a cardiac pacemaker, or daily use of beta blocking medication: As reported by the patient and/or documented in the medical record. * Plans to start or participate in another new behavioral health intervention or psychotherapy during the study period.