Chris looks fucking terrible. Arguably he looks the worst he ever has. The sickly complexion, the slack skin, the bags under his eyes...he's a 40 year old man, yet he looks at least 20 years older than that.
My gut feeling is that the longer Chris was stuck in jail forced to face the fact that the Merge wasn't going to happen and he didn't actually have any powers to escape the situation, the more he came to understand how fucked he was. He started to become more and more upset and desperate, which became apparent in the letters he was writing. When he found out that his case was going to be continued once again and they wouldn't be letting him out, Chris snapped and pitched a massive retard fit. The jail became concerned that Chris might become a danger to himself or others and decided it was best to send him to a facility for mental health treatment until they were sure he was safe and stable enough to return to wait out the rest of the case.