Haven't read past this post at the moment, I sincerely wish you the best my friend, but I will put a different light and perspective on this, when I read this, all I could think about was thank god. I know that doesn't sound right, Consider the 4-5 month nightmare over! you should breathe a sigh of relief and rest easy knowing that your children are NOW safe and unharmed, alive and well, and they are in your protection. You are a good dad because you took them away from thier NIGHTMARE. I know it's not enough and you wish you could have done much more much more. I don't normally believe in revenge, but I do believe somewhat in justice and I think the mother of your daughters is clearly the one who should be severely punished for putting YOUR lovely daughters through this.
I'm sorry for the tradgey that has happened to you, I will absolutely keep you and your daughters in my prayer. I wouldn't beat yourself up to bad, instead put your best foot forward and be the best most loving dad you can be. I'm sure your daughters need you now more then ever. you ended thier nightmare, now give them everything good and wonderful that a good dad like you should.
My prayers go out to you bro.