Well, where to start? How about at the root of the problem? Even if you do divorce her there is a very real chance that you will find somebody just like her, maybe worse and then you will be no further along, possibly further back. You say you are extremely skinny and depressed. Believe it or not part of your problem can be nutrition which is easily rectified. I'm not going to go to great lengths explaining it but if you are interested message me and we can get started. Other than that, apparently there is the likelihood that your parents have programmed your mind to think that you are no good and probably don't deserve any better than you have. Just like a computer our brains are programmable and also reprogrammable. "Be transformed by the renewing of your mind!" As a non-Christian we were shackled to the outer man, the body that is corruptible and condemned to death. Unless we are reborn to spiritual birth that is our understanding of what life is, to serve our flesh, all it desires. Once we are born anew we are released from this meaningless existence. Our eyes are opened and realize the flesh will never be satisfied, and to serve God because He, through Christ will raise us from death. Some people who are Christians are still living in the flesh unsatisfied because they have one foot on earth and the other in Heaven. They want to serve God but still hinder themselves because they want to live like the heathens. They desire sex and belongings and to be esteemed, and accepted by the world. Here is my point, finally. If you have accepted Christ as Lord and Saviour, then you have been set free. You don't have to stay in that relationship, in fact you don't need any relationship. No woman is going to make you feel whole, and valued and desired. As far as I have seen, most women have their own agenda and use men to fulfill their desires, like pawns. I'm not even kidding, I wish I was. In trade, they provide comfort and "love" but that's not really the proper design. Men and women were supposed to be teammates fulfilling God's mission for the man's life. They share the work and in the success of their mission. I know I'm going to get blasted for this but most women are more interested in the successes of their children and use their husbands to serve that purpose. As long as the man has his occasional sex, a hot meal and the remote control he's happy. Yes, this is a rant, and I hope all see it is righteous indignation, that men need to stand up and be men. We need to be the leaders and have a freaking plan, to serve God and not let women walk all over us. Don't be needy, be productive and confident and if a woman isn't interested in you, move on (unless she's super hot! I'm kidding). Disclaimer* I'm sure some women aren't as I've described....I just haven't met you yet.
It seems as if you misunderstanding the whole divorce thing and it being a sin or not. If your wife does nothing but lash out and verbally abuse you and has no love for you at all and isn't going to change that is a reasonable reason for divorce because she is being unfaithful by treating you like garbage and God doesn't want you to suffer in an abusive relationship in fear of sinning trust me I have personally seen un needed pain and suffering from abusive relationships specifically because they thought it was a sin to divorce.