Just a thought.......it seems like you need to bide for more time. Time to get some sound financial advice from an objective source. How about saying to your H, and I might write it down in a letter or email, "thank you for thinking and watching out for all of us financially. I will need to give this some thought. Please give me a week, (or any set amount of time you think you need) and I will get back with you."
I have learned that short and sweet is better than too wordy while DBing. Be polite and respectful but don't give him any more information than you need to at this point. Let him know you appreciate his efforts, give a time line to get back to him and leave it at that. And then do your work and have his suggestions checked out by someone you trust. This is not devious as you are not working together as a husband and wife team right now. You definitely need to watch out for yourself and your children financially right now and to do that responsibly you need confirmation of his plan from someone other than him. He may react less than charmed by your response, and prepare yourself for this, but his possible displeasure does not mean failure. There will be alot of times he does not like your responses right now and he may buck you, because you are changing the dance between the two of you. Keep up your 180's. He will notice even if he does not let on. He is expecting you to react as you always have in the past, but you are NOT going to do that any more right?