Sounds like some excellent advice from your coach!
The holidays are tough when you're going through this. You'll be on kid overload and then your W has them and you're slammed with all kinds of difficult, lonely feelings. Try to have plans to occupy yourself, especially if you're taking time off and won't have the kiddos. Fill your days with activities. Make a list, might be chores you need to get done, or fun stuff you want to try, or both. Go down the list, do the things, check them off and do the next. Stay busy, ESPECIALLY if you want to just wallow in self-pity!