Glad you found the councelling helpful. Your councellor has a very good point. You cannot change his nasty behaviour all you can do is change your response to it. For example, don't ask him when he is moving out because you know the answer you will get.
Walk away if he starts telling you stuff you don't want to hear. You know you are a good mother. Maybe this last week you have not been 100% there for them but that is totally understandable.
You do not have to have these conversations or listen to him. Put a lock on the inside of your bedroom door and lock yourself in there if he is talking at you or go out for a walk. 15 minutes will not harm the children.
Put a lock on the outside of the door and lock it when you are not in there. Keep any paperwork you need safe in there and away from him.
Disengage from him apart from on a basic level over the children, he has already proved in this last week he has no interest in saving your feelings in the slightest.
Just carry on organising what you can and sorting your options re mortgage, renting etc. Once you feel you are in a position to take things forward tell him to discuss it with you, come to mediation or your lawyer will communicate with his. Emphasis that the last option will cut into those non existant funds he wants to protect by not moving out.
Start keeping a diary. This thread can give you plenty of starting points for his attitude and behaviour. Times and dates. Even if it is not useable other ways it will be fantastic for you to look back at if he denies or says different things to previously.