If your wife is abusive,mentally and physically, to you, is it the same with your children? I hope that's not too invasive a question, but if she's abusing your children as well as you, then it won't do you or your children any good to stay in that kind of an environment. If you think your marriage can be salvaged then try some counseling. Can you bring this up to your wife,or will that provoke her to hit you as well? If that's how it is,then you really need to leave her.
As for the smell,I honestly don't know what to tell you about it. Maybe you could try showering together and you wash her . . .if that was suggested already,sorry, I barely read most of the other posts.