The quicker you come to realise that your feelings for him are based on your illusions of what you thought or believed him to be offering you, namely, the love and security of a happy family which, in turn, are beliefs you projected on to him rather than anything he was actually offering, the quicker your feelings for him will diminish.
Your task is to separate fact from fiction and ground yourself in the reality of the moment. As what was a volatile and destructive relationship is now dead in the water, you can no longer spend time engaging in the heady adrenaline rush of breaking up/making up and, instead of obsessing over him, you're best advised to find a way of channelling your energies into more contructive pursuits.
I'm still getting the feeling you're intent on showing him what he's missing with a view to getting him back in your bed, but you must see it's gone far too far for that. He's got a caution for physically assaulting you on his record and, if he's got any sense at all, he isn't going to want to come anywhere near you again.
In addition,it's probable that SS will require you to give some undertaking not to allow him into your home, certainly until such time as they've completed their investigations into last week's incident and the further allegations of child abuse you've made against him.
You mentioned that he is now employed part time which is fortuitous because, if he has in actual fact legally adopted your eldest dc by another father which I freely confess I consider to be unlikely, he now has 2 dc to support in addition to his dc by an ow.
I hope you've managed to get some sleep and are able to get your dd to school by hook or by crook. Does the school have a notice board for parents to ask others to assist with school runs, etc?
If not, today will be as good a day as any for you to begin networking with a view to find other dps in your immediate area who may be willing to take your dd to and from school in return for an offer of after school child care or a few hours at the weekend so they can get to the shops/attend to other matters etc.