You just do, with grace and dignity (and counseling--are you in IC??). Because you have to. You are a good mom, a strong and stable and intelligent person, and you also need to show them you are not a victim-- show them you have resilience and even compassion for those who have hurt you.
We didn't choose our situation, but here we are. Life throws all kinds of sukky stuff at us...all we can do is be the best people we can be and Learn and move forward.