He chucked your stuff out the window? Seriously? What will he do when he gets annoyed that the baby has been crying for too long? What messages will his behaviour send to your little one about how a marriage works?
Did this really all just start 6 months ago? Were there really no signs before then? If that's true, it might be something the two of you can work out. But it seems like a massive shift from loving partner to threatening to throw your pregnant wife out of the house.
Only you can decide what type of treatment you're willing to put up with, but remember that the baby has no choice and is relying on you to do what's best for both of you. As PP suggested, getting support is important. May I ask why you don't want your close friends to know? How would you feel if one of your close friends came to you with a similar story? Would you think less of them or would you just want to help? Chances are your friends and family would feel the same.