Anxiety and depression therapists and psychiatrists in Fullerton, CA

I work primarily with young adults who are feeling overwhelmed, burned out, or stuck — especially when it comes to anxiety and relationship challenges. Many of my clients are used to holding it all together on the outside, but internally feel lost or unsure of how to move forward.

I bring a calm, grounded presence to the work, even in high-stress situations. Much of my background is in working with clients in crisis, which allows me to help you navigate difficult emotions without things feeling out of control. At the same time, I’m warm, relatable, and honest — I’ll meet you where you are, while also gently challenging patterns that may be keeping you stuck when or if needed.

Hi, I’m Mercy Nyeche, DNP, PMHNP-BC. I’m a board-certified Psychiatric Mental Health Nurse Practitioner dedicated to helping adults regain clarity, confidence, and emotional balance.

Reaching out for support can feel overwhelming especially when you’re used to being the strong one for everyone else. Whether you’re navigating anxiety, depression, burnout, life transitions, or feeling stuck in patterns that no longer serve you, you don’t have to do it alone.

My approach is compassionate, collaborative, and evidence-based. I take time to truly listen, understand your goals, and create a personalized treatment plan that fits your life, not just your symptoms.

Please note that I do not provide disability paperwork, leave of absence documentation, FMLA forms, legal letters, school accommodation letters, or other administrative forms. The only documentation I provide is a work excuse note for the date of your appointment and, when clinically appropriate based on my evaluation and professional judgment, up to three (3) days off from work. If you require any of the services or documentation listed above, I kindly ask that you schedule with another provider who offers those services. Thank you for your understanding and for helping ensure that your healthcare needs are matched with the appropriate provider.

I hold a Master’s degree in Clinical Psychology from Antioch University, Santa Barbara, California. My practice blends both psychological approach as well as eastern wisdom. With a diverse background of professional and life experiences, I bring empathy, warmth, and a solution-focused mindset to my clients. My goal is to help clients alleviate suffering, boost their productivitiy, and enhance well-being.

I grew up in a small town in Hawaii, then came to Southern California and began studying psychology in 2001. I completed my master’s degree at Fuller School of Psychology in 2010 and served children and families at a community mental health agency for 10 years, also starting a private practice in 2015. While I loved island life, I’ve put down roots here through friendships, involvement in my community, and my love of LA’s cultural diversity.

I am a bilingual (Spanish & English) marriage and family therapist licensed in California with over 14 years of experience working in clinical practice. I am born and raised in San Francisco's Mission District. I am Salvarodan and Nicaraguan; and a native Spanish speaker. I have served clients experiencing multiple occurring conditions requiring some form of crisis stabilization service or intervention. I have counseled individuals and families dealing with an array of issues such as immigration/deportation, domestic and community violence, teen pregnancy, work – readiness, homelessness, substance abuse, and more. I use a client-centered and strengths-based approach when I work with clients. I believe that it is critical to collaborate with cleints in identifying and attaining what they are seeking. I believe that clients are experts in their lives and I am an expert my field.

Some seasons of life ask more of you than you ever expected, and somewhere along the way you stopped feeling like yourself. I work with teens, parents, and adults who are moving through anxiety, depression, grief, relationship strain, and the heavy stretches that come with big life transitions. I care deeply about supporting LGBTQIA+ and transgender clients, and families who want to understand and show up for one another a little better. So much of this work is simply remembering that you do not have to carry any of it alone.

I'm a Licensed Marriage and Family Therapist with experience working in community mental health, co-occurring substance use treatment, and residential care settings. I work with adults experiencing anxiety, depression, trauma, substance use challenges, mood disorders, relationship stress, and major life transitions.

I believe therapy works best when clients feel heard, respected and supported without judgement. My approach is collaborative, trauma-informed, and tailored to each client's unique needs and goals. I draw from CBT, motivational interviewing, and strengths-based approaches to help clients build insight, emotional stability, and healthier coping strategies.