Is he on any pain meds?
I had a similar experience. I was totally paralyzed within 2 days of diagnosis, including ventilator. I was on vent from apr 12 to june 6th. I developed a deep bed sore during that time, make sure they are turning him! But they put me on 4 mg iv dilaudid every 4 hours. I went from fighting to get better to a junkie. I really went backwards until October when i came off the narcotics.