Well, if your xh has a serious health condition, then he better make out a will which stipulates exactly what you and the children should receive, especially you because of the settlement issues. He also needs to up his life insurance too.
It's interesting that he's having chest pains. It may be serious and then again, it could be stress and anxiety about what he's done/doing and the fact that he owes you money. If he's taking you back to court, maybe your lawyer needs to ask for medical documentation concerning his health issue so that it can be put on the record in case he croaks any time soon.
Laying all jokes aside, he does need a will to stipulate what the children will receive, as well as any and all monies owed to you in case of his death. After all, if he dies before he pays you what he owes you, the new raspberry beret woman may not look favorably upon you and settle up the debt.
Just my two cents.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.