Relieve your stress in healthy ways - hang with the kids, work out, watch movies, read books, go for a walk.
Keep your nose clean.
Keep your L involved.
And let her worry about herself. You can't fix it for her. She's going to go thru a lot of emotions. Anger at you for "screwing" things up for her. She'll probably vacillate to guilt and remorse. She might try being nice, she'll also throw more $h!t your way.
Not your problem. You can control you. So work on the things you can control and take care of your boys.