What makes you think that he's going to ask for a divorce? He may not. Why don't you have time on your side? Unless you live somewhere that states that a divorce can take place in 60 days, you've got more time than you think. You've got plenty of time to focus on what is important...
When you are attempting to make decisions in a panic and/or anger, step back and wait at least 24-48 hours before making decisions. You've got to make decisions in a calm manner.
Your husband is definitely in replay if he's talking about quitting his job and getting a different one. There is nothing you can do about him and his decisions. You can't control him nor can you convince him that what he's thinking of doing is wrong. BTW, they get angry and that anger is vented towards you and the world. They can't tell you why they are angry, but I think it's because they are not happy w/themselves or how their lives are going. Their crisis is all about them, i.e., how they feel, etc. You didn't break him, therefore, you can't fix him. He has to do this on his own.
We have advised you to take a look at your finances. Have yo done this? This is the first place to focus. If you have a joint account, move some of the funds over into a new account with only your name on it. If you have joint credit cards, get your name off of them. Do not believe a word that comes out of his mouth that he will take care of you. You will need to ensure that you are financially secure. As for health insurance, you need to start looking into that as well.
It is time that you focus on YOU and what you will need to do in order to survive the fallout of his crisis.
