J4J. DON'T LET THIS MAN BACK!
I know you are hurting. I know you love him. I know you want this to work beyond ALL else.
BUT (and forgive me if others have said this)
NOTHING will change for the better if you let him back into your life.
THE ONLY CHANCE you have to get him to see what he has done and to stop it is to make sure that he has NO support, NO-ONE in his corner. He has to see that the consequences of KNOCKING YOU OUT in front of your children, STEPPING OVER YOU and leaving you for all intents and purposes for DEAD* are that he leaves your life.
He may then, once he has lost everything, realise that perhaps that wasn't the best idea he ever had.
I know I am sounding flippant, but these men don't see what they do as wrong. He'll be saying that YOU had a part to play in his punching you so hard you lost consciousness. (you didn't) He'll say YOU drove him do it (ditto, you didn't)
Think about it. You've been cross, angry, furious in your life haven't you? How many people have YOU hit hard enough to KILL?
You realise that a punch that is hard enough to knock you out in one go is hard enough to kill don't you?
You'd be a statistic. you'd be the 1 of the 2 women killed this week to DV.
If he does THIS as a first attempt. What do you think he will do for the second. And there WILL be a second if you let him back.