The only Biblical recourse for a horrible marriage, or any marriage for that matter, is death. If your husband is an abusive, mean, hateful, fill-in-the-blank jerk in spite of you doing your best as a wife, God can kill him whenever He wants to. If he is still alive, God must want you to still be married to him. A wife could pray and fast for her husband/marriage, and for the kids to turn out right in spite of marital problems. If nothing else, it will be a great lesson for the kids, who hopefully will grow up and make wiser and more careful choices regarding their future spouse, rather than learning that marriage can be dissolved at a whim.
Update: Zsuzsanna adds more in her comments section:
Update II: Another comment:
God punishes adultery, as well as rape, with the death penalty.
the same God who said that marriage is until death also said that homos should get the death penalty.And now for something completely different:
Sister Sarah's Battle Hymn
And a godly graphic from the Free Republic: