I'm sorry to hear about this.
At the very least he can't drink if he's in the hospital. It might be the time he needs to get it out of his system and acknowledge his problem.
You didn't do anything wrong, it was probably just the booze talking when he got mad. I had a similar experience with my mom once when she confiscated a drink my underage little brother had at my sisters wedding. It was just baseless drunken anger from me because I felt it threatened my own drinking for whatever reason.