First. You're doing the absolute right things by having a trail of effort to keep him up to date about it all. His lack of response will bode well for you in the end.
Second. Consider viewing yourself as a mom that is a widow. You lost a spouse. You are going to do what is right by your kids because it is the right thing for them. But you will be figuring out how to do it alone.
You will be amazed at how the strength will come welling up from within in places you didn't know you had.
Don't worry...you got this!!!