I'm very sorry that your daughters are in so much pain. At least w/the meltdowns, they were able to express themselves for how they feel. Divorce is never easy for adults, but it is far worse for the children.

I do hope that things will be better today and tomorrow for them.

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.