Obsessive-compulsive disorder therapists & psychiatrists in Lancaster, CA

I am a board-certified Psychiatric Mental Health Nurse Practitioner (PMHNP-BC) with a DNP (Doctor of Nursing Practice) degree from the University of Massachusetts Global. I have experience working with adolescents and adults in multiple settings facing various complex mental health issues, including OCD, depression, anxiety, ADHD and mood disorders.

I’m a licensed clinical social worker who specializes in helping children, adolescents, adults, couples, and families navigate anxiety, depression, panic, trauma, PTSD, and other life stressors. With experience in psychiatric crisis care and community outreach, I believe healing starts with feeling safe enough to show up. My goal is to offer real, judgment-free support that meets you where you are and helps you move toward lasting growth.

My name is Dianne Fontaine, MSN, APRN, and I'm a Licensed Psychiatric Mental Health Nurse Practitioner, Board Certified (PMHNP-BC) by the American Nurses Credentialing Center (ANCC). I obtained my Master’s Degree from Walden University and has undergone advanced clinical training, equipping me to assess, diagnose, and treat a spectrum of psychiatric illnesses, as well as provide psychotherapy.

If you have tried therapy before without the results you hoped for, you may need a more targeted, effective approach. Over the past 15 years of my practice as a clinical psychologist, earning your trust and helping you establish a secure, empowering baseline for your care has been a profound privilege. As a former instructor at the David Geffen School of Medicine at UCLA and a provider at the UCLA Insomnia clinic, my goal is to provide more than just a space to talk—I offer the specialized, gold-standard steps necessary to create measurable, lasting change. At my practice, YCBT Services, I focus on working with adolescents, adults, and seniors who feel stuck despite their best efforts, specifically targeting generalized anxiety, social anxiety, OCD, panic disorders, and chronic insomnia. By addressing the underlying triggers that keep you on high alert, I am fiercely committed to helping you move beyond surface-level coping to reclaim your peace of mind.

My goal is to create a space where you feel seen, understood, and supported. I believe mental wellness is an essential part of overall health, and that healing begins by moving from survival to thriving through nervous system regulation, processing past experiences, and strengthening the mind-body connection. Meaningful change and healing happens within a strong therapeutic relationship built on trust, authenticity, and collaboration. Whether you're navigating anxiety, depression, trauma, relationship challenges, addiction, performance anxiety, work-related stress... or simply feeling overwhelmed by life's demands, we'll work together to build insight, process difficult experiences when appropriate, develop practical coping skills, and create meaningful, lasting change.

I can understand first-hand how difficult it can be to reach out for help for the first time. I believe in the importance of "practicing what you preach" and I have been the client in the room who needs extra support. I invite you to give yourself a chance, try something new, and gain a healthy perspective on how to address complicated moments in your life.