A 37-year-old patient was repeatedly treated in a psychiatric hospital. The current hospitalization was due to behavioral disorders in the form of reticence, refusal to eat, periodical chaotic excitement with stereotyped movements. During the examination, the patient is sluggish, remains in bed, and no contact with him can be made. He does not answer any questions, his position is monotonous, he is hypomimic. The " proboscis " sign, the waxy flexibility of the muscles, and the " psychological pillow sign are observed. This condition lasts for a week already. What is the provisional diagnosis in this case?