Divorce is difficult, no two ways about it.
I know that staying in the moment works best for me in all things. "What iffing" is a great place for fear to get a stronghold.
Try not to future trip. He may lie, he may get more than you feel he is owed, but the key for you is to maintain your dignity, integrity, and serenity regardless of his crazy.
Can you switch to interacting only through the attorneys?