I have known people who have reconciled after being separated more than a year, and even at the 11th hour. But if you want him back you have to do some things differently.
First you have to attract him back. And second, you have to communicate differently with him. Did you try the power packaging? It takes a lot of work. But you need to do it to get his attention when you are talking to him. I imagine with all you have going on with the house, financials and 5 kids, and having sickness recently that you are exhausted.
No one can blame you if you don't do it, his behavior isn't your fault--but you are the one who will have to do the work if your goal is to get him back. Eventually, he will have to work at it, but that is awhile down the road, realistically.