Oh Simon. that was incredibly courageous of you to confront him. first off - stay safe & do what you feel like you need to do to take care of yourself? Can you stay at a friend's place for a couple of nights? I know your dad isn't very helpful... but can you at least tell him that your brother said he'd move out and try to get dad on board for that... you know encouraging him, helping him pack etc?

That was a bold move, you're really standing up for yourself. Good luck & hang in there... the only feelings that matter right now are yours.