A Study Of Auricular Transcutaneous Vagus Nerve Stimulation In Chronic Dizziness

Inclusion Criteria: * Age 18-75, Persistent Postural-Perceptual Dizziness (PPPD) diagnosis per International Classification of Vestibular Disorders (ICVD). * Persistent dizziness ≥3 months and at least 1 dizziness exacerbation/day during 2-week run-in. * On stable medications/therapy for ≥4 weeks prior to baseline (if any). Exclusion Criteria: * Uncompensated peripheral/central vestibular deficit, sensory-afferent or cerebellar ataxia. * Cardiac disease (coronary disease, unstable arrhythmia), recurrent syncope (\>1 in past 12 months). * Neck surgery, vagotomy, or any condition interfering with vagal stimulation. * Pregnancy.