Twinkerbell - you've done so much in such a short space of time! You need time to process this and grieve for your relationship. No wonder you are struggling, it's perfectly natural and it's just too much to take in all at once.
Was your house already on the market or have you marketed it and sold it so quickly?
How old is your DD? Can you possibly, in an age appropriate way, gently explain what her father has done? You shouldn't be taking all the blame in this, but I was also told by a family support worker that children lash out at the resident parent because that's who they feel safest with. They know we aren't the ones who abandoned them and therefore know they're secure enough with us to offload the anger and upset that they are experiencing. Try not to take it to heart but god, I know exactly how hard that is.
All any of us can do is take baby steps throughout all of this. Not even one day at a time, I've literally had to do one hour at a time during some of this last year. Honestly couldn't think any further ahead than that, just to get through yet another hideous day. There's nothing wrong in that, our minds can only take so much.
Start - I could've written your post exactly this morning. I've finally received a copy of ex's last tax return. Funnily enough, his income for 2016 is 8 times that which he told Child Maintenace Service. The bastard.