Heather, I'm going to ask you a personal question and you do not have to answer it...but do you have a will in place? If not, you need to think about that. Why? Because you are right now the sole custodial parent of your youngest daughter. Even though you are still married, you want to ensure that she's taken care of and what you would like to do w/the rest of your worldly possessions. You need to have someone named as your executor so that he/she can oversee your wishes if, God forbid, something were to happen to you.
Again, this is something you can think about doing when you have a moment to breathe.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.