If you are experiencing an emergency, please call 911 immediately or to go to your nearest emergency room. LOCATION. 26691 Plaza, Suite 221 | Mission Viejo, CA 92691. TELEPHONE (949) 689-5892. EMAIL. hsia@ocanxietycenter.com. DIRECTIONS. The OC Anxiety Center is centrally located in Mission Viejo, 15 minutes from both Irvine and San Clemente..