oh Peter, that's horrible. Of course, the day is not over so things CAN get better.

What you've described show pretty blatant "abandonment" behaviour by your W. Chalk that up to "knowing" and nothing more. I want to be clear that it's not a judgment, just fact of actions.

Your W's priorities are obviously extremely focused on herself. She's "deep into it" as it were. Needing someone to drive her car back from where ever she was... well... as much as you may not want to see it that way, at least SOMEONE, if not your W, was being responsible.

How you decided to handle this will be your choice. Whatever you choose, do so with the greatest care and compassion for your children, and for yourself... and... for your W...

Be well and have a better day.