Diagnosis of Mood Disorders

In the context of clinical psychology, mood disorders are often characterized by significant disturbances in mood that can impact various aspects of an individual’s life. Consider the following case study:

Emily, a 32-year-old graphic designer, has reported experiencing mood swings that alternate between episodes of extreme energy and enthusiasm, during which she feels invincible and highly productive, followed by periods of deep sadness and a lack of interest in her usual activities. These changes occur rapidly within a matter of days or weeks and significantly impair her social and occupational functioning.

Based on this description, which diagnosis is most likely applicable to Emily's condition?