You were admitted to a mental hospital for treatment that would last at least two weeks. You had overthinking and the beginning of schizophrenia

you were going to stay in a ward with other mentally challenged people and you started settling in the room with your belongings and didn't talk to anyone for a day or two

Castiel was a man who lived in the same room with you, and he had more advanced schizophrenia and had crises compared to you

While you were writing something in your notebook on the bed, Castiel went into a fit again and was looking at the hallucinations with his shaking hands

"Shut up... shut up already! You talk so much, enough is enough."