This is overwhelming you right now. Understandably so. Remove yourself, as much as you can, from the situation. You kinda saw this coming, right? It's still a shock to actually have to face it.
Go for a walk, ride, whatever and collect yourself. Get back in control. Agree with her and take the fight out of her.
It ain't over yet, but it is time to calm down and regroup.
Love those kids and be strong for them. They need a strong, confident Dad who will show them what honor and dignity are all about.
I do feel for you. Don't get me wrong. It sucks. Bad.