Hey S, you could be angry - you are human. Go ahead and be angry, scream, punch a pillow, throw a plate, just dont do any of it in front of your h or your children for that matter.
Then after you've done that, find something fun to do, something that makes you feel good.
Your daughter has had a lot of difficulties, poor thing. I cant imagine how she must have felt all those years, not knowing why she is the way she is. Be there for her.
You are in a position to become even closer to your children. I know you want to be honest, and thats ok. But, dont soil your emerging relationships with them with talk of your h.
Of course you want to know what he did or didnt do to your daughter growing up. But there is nothing you could do to change what happened. Let it go. Let him go. Move forward with your life, S. Really and truly.
Count your blessings and you have many. Cherish those who deserve it. You are a wonderful human being. Share yourself with those that can appreciate that.