A 49-year-old patient complains of itching, burning in the external genitals, frequent urination. The symptoms has been present for the last 7 months. The patient has irregular menstruation, once every 3-4 months. Over the last 2 years she presents with hot flashes, sweating, sleep disturbance. Examination revealed no pathological changes of the internal reproductive organs. Complete blood count and urinalysis showed no pathological changes. Vaginal smear contained 2025 leukocytes in the field of vision, mixed flora. What is the most likely diagnosis?