I agree with a lot of the responses. He needs to grow up and be a man. With two children, its time. If you don't have respect, you can't have love or anything else.
Put everything into perspective in your own mind.. do you want your daughter to grow up thinking its normal and ok for a woman to be treated like this? That its normal for a "daddys" role to be the one your husband created?
Most children pattern after their parents.. sad, but true. And she could very well end up marrying someone who treats her the same way or worse because that's the familiar.
Go get some counceling. Together if possible.. for yourself if not. Then that will help you sort out the big decisions.. and be stronger in yourself. THAT'S what you want to model for your daughter. That women can be strong, independant, and are worth the world.
And as you get stronger if you stay in the relationship... know you'll get flak. He'll know your changing and it will scare him. He'll either grow up, or you'll know he never will. Either way, it will be better for everyone. Then you'll know if it can be saved or not.
You do deserve love and respect. Everyone does. It'll tear you apart to keep the status quo. So choose not to. That's my advise.
Good luck, its a hard road. But do know you can't change anyone.. they have to change themselves. Your only responsible for yourself and your daughter. And I agree, you do have 2 children right now, ready or not! So try to love and cherish the other little girl, she may need your help more than you realize!
I used to have panic attacks myself... take things as they come and try not to worry about what is next. Set goals you can achieve, and don't take on extra things. You've got enough on your plate right now, set things in motion as goals to help the situation instead of things you have little control over.
You need to focus on yourself right now.. and make YOU a priority. It will help your daughter out tremendously.
J.