Dr. Erin Overstreet, Psy.D. is a clinical psychologist in Carlsbad's La Costa corridor who has specialized in LGBTQ+-affirming psychotherapy since 2009 from her El Camino Real office at the Alga Road intersection. Her training in Prolonged Exposure Therapy targets trauma and PTSD recovery through structured, evidence-based desensitization protocols, an integrative clinical approach that aligns with the functional-medicine framework at Quantum Functional Medicine on the same El Camino Real corridor. Overstreet's additional focus areas include addiction and substance abuse treatment, infertility-related psychological distress, anxiety disorders, and depression in adults and adolescents aged thirteen and older. The practice provides specialized support for clients exploring gender identity and questioning, serving a population that generates significant search demand for affirming mental health care in North County San Diego. Recovery-focused clients who incorporate physical wellness alongside therapy sometimes coordinate with Hydration Room for IV-based nutrient replenishment following intensive therapeutic processing. Overstreet's highest-acuity cases involve multi-session Prolonged Exposure Therapy sequences combining imaginal revisiting, in-vivo exposure hierarchies, and cognitive-processing worksheets to treat treatment-resistant PTSD presentations.