Sаrаh, а 28-year-оld wоman, presents tо her psychiatrist's office with a history of chronic low mood and feelings of hopelessness dating back to her adolescence. She describes her mood as consistently "down" for as long as she can remember, regardless of life circumstances. Sarah reports that she often struggles to find enjoyment in activities she used to love and feels exhausted even after a full night's sleep. She has a long history of difficulty making decisions and concentrating on important information. In addition to her persistent sadness, Sarah frequently experiences intense worry and fear about various aspects of her life, including her relationships, work performance, and health. She describes feeling on edge most of the time, with racing thoughts and physical symptoms such as muscle tension and restlessness. She admits that these anxious feelings often exacerbate her depressive symptoms, making it even harder for her to cope. Despite multiple attempts at therapy and various antidepressant medications over the years, Sarah's symptoms have not significantly improved. She feels increasingly discouraged and overwhelmed by the prospect of managing her condition long-term. What is the best diagnosis for Sarah including Diagnostic Code and appropriate Specifiers?