You really need to talk with an attorney, if divorce is your goal, before you take any action.
It's only been a week since he moved out. It takes weeks and sometimes months for someone to get past the hurt created in an argument. You are both hurting and angry. It's important to not make important decisions this soon. You are critical because he's not provided money or a phone call. It's only been a week! Calm yourself down. I imagine you're scared stiff. I would be. If your husband has been financially supportive up until now, I'd assume he'll continue to be. He may just need time and it will work to your benefit if you give him that. Right now you're pushing him into a corner. Please back off. Take deep breaths. Make an appointment with the counselor.
I urge you to get started in counseling. You sound unsure of what you want and what is best for your children. Your husband is reacting in an immature way and you're wanting to make quick decisions. Bad combination! Please take time, get professional help, and accept that as painful as this is the only way you can move on is to take things slow and get helpful information about yourself and what you wan. You have to be able to provide for yourself and your children emotionally and financially.
I'm not surprised about his reaction and actions. It's only been a week. I'm not surprised that you want a quick resolution. You must know that a quick resolution is not possible. Both of you need distance from the fight that caused him to move out.
As to their father not seeing the children, perhaps he's in too much pain or too angry to face you. Perhaps you could suggest that you'd drop the kids off at his parents for an hour or twos visit when it's convenient for everyone. I imagine the grandparent's miss the kids too.
Do all you can to remain civil and eventually gracious to your husband and his family. It's natural for you to be exceedingly angry too. Counseling will help you learn how to manage your anger so that you can be constructive in your actions to take care of yourself and your children.
Divorce may be the answer but it's too soon to know. He canceled the counseling appointment in anger and it sounds like he canceled it because of things you said that were best left unsaid. You can't fix it in a week.
I urge you to make another appointment and go to it. In my opinion you have nothing to lose and something to gain by going at this in a slow and methodical way.
I want to repeat what Denise S. said as an explanation for your husband's attitude. "In his eyes, you've already called it quits, so why try?" No matter how many times you ask him what he wants, he's feeling too vulnerable to give you an answer. I've experienced this many times with friends after we've said things in anger. It takes time to rebuild the trust.
Later: I see that there is more to this story than you've told us with this post. Your last post, on Oct 26 said you packed his bags and told him to leave. No wonder he won't commit himself to anything. He's scared! He's hurt! Yes, you are too. And it sounds like this all started last year because of a fight within your extended family last Thanksgiving. Of course, the time of year has brought to the surface all those feelings.
I URGE you to get counseling. I hope it's not too late. You've been stewing over a circumstance that came to a head nearly a year ago. Your angry feelings have grown and multiplied. You have to deal with them before you can move on, no matter if you stay together or not. Go, run, get counseling NOW.
I also urge you to be honest with yourself and others. What has happened happened. You can't change it by talking about it in a different way. Face up to the problems. They're on both sides. Both of you have experienced a negative life at least for nearly a year. It will take time to heal the pain. Give yourself and him the time that it takes. Unless your marriage has been totally unhappy from the beginning, don't give up now. Deal with what happened last Thanksgiving. Learn how to express your feelings without anger. Learn how to work thru the issues together. You can do this in counseling.