Inclusion Criteria:  Diagnosis of obsessive-compulsive disorder (OCD), body dysmorphic disorder (BDD), illness anxiety disorder (IAD) or somatic symptom disorder (SSD) Living within California Capacity to provide informed consent  Exclusion Criteria:  Current bipolar disorder or psychotic disorder Active moderate or severe substance use disorder, lifetime severe substance use disorder Pregnant or nursing women Use of prescribed psychotropic medications other than fluoxetine for 2 weeks prior to study start Having commenced OCD-targeted exposure and response-prevention (ExRP) psychotherapy within 2 months of study start