A 38-year-old woman made an appointment with a doctor. During her visit she talks a lot, speaks quickly, and rapidly switches from topic to topic, which makes it difficult to understand her speech. The patient cannot sit still on the chair, gesticulates, suddenly starts singing, laughing, reciting poems. She thinks she is "the healthiest" and claims that "everyone envies her good looks and beautiful voice". According to her relatives, she has not been sleeping at night for the past 5 days and her appetite has increased. Three years ago, she was treated by a psychiatrist for depression. What syndrome is most likely in this patient?"