Hey MOgs, this sucks, sorry.
COuple of questions. DOes your state have a common law provsion? In delaware we dont, but maybe yours does. THat might allow you some recourse on the house.
Looking at your post i see a few things that i want you to think different about. THe loan your dad gave you, he isnt talking to you anymore, so honestly what do you have to lose if you stop paying and move out of the house? Abuse is bad, be it verbal, emotional, physical, or sexual. Getting out and starting over is not the end of the world. I restarted my life almost two years ago with a blow up mattress, and a lamp. I had some clothes and my bikes. THat was it. But i had to get out of that house. And i stayed way too long trying to fix stuff also.
Look at roommate situations, or renting a room. Think cheap, and everything should be on the table. If you have to cut, everything should be up for a serious thinking as to you needing it or not.
Yes your credit will take a hit, you may even have to declare bankrupcy. But honestly that wont affect you as much as the hate you feel in your soul for this person. WHen you are realy to leave everything and let go of everything, then you will know its time to walk away.
Hope this helps.