"I felt listened to and supported.Thanks Dr. Biggs for helping me regulate my symptoms and remedies." A referral into a psychiatrist or psychiatric mental health nurse practitioner (PMHNP) is often not required. However, consulting your Main care medical doctor (PCP) 1st could be useful and should streamline the whole process https://brainhealthusa.com/psychiatrist-la-verne-los-angeles-county-ca-substance-use-disorder/