What has God put in your heart during this? When I was going through a similiar situation I prayed tons and one of the prayers I would always ask for God to open my eyes, heart, mind, and soul to what it is I am to learn quickly to prevent any separation. All I kept feeling was to hold on to my husband by letting him know how much he is appreciated, loved, cared for, and desired.
Long story short, I even when he was screaming at me and critising my worth, nature, looks, love among many other things, I would always stay calm (with the exception of crying) and would listen to him, then I would continue to do as God laid on my heart. I would remind him of actions I did because I appreciated him, I would remind him of words or expressions I did because he was appreciated, I would remind him that I am not lashing out with hurtful things and I could go down that road, but I love him and I am not willing to treat him as though I do not, I would remind him in what ways I cared for him (homemaking stuff, planning of surprises from large to small, serving his food at the dinner table, sex, and so on), lastly I would show him and tell him that he is and was desired.
Sometimes when he was really mad, I would leave the area for a moment and pray and I would for whatever reason strip off my clothes and walk back in nude. This worked a lot, he usually couldn't be rageful. I always made myself vulnerable to him, and most the time I felt crushed, but I refused to let him leave without giving it my all.
After this horrifying, but eye opening experience we went to a male Christian counsler, and what I thought was ironic during our sessions because I thought I was going to hear from him all these horrible things about myself, but I was wrong. He said it was always him, never me. He said everything to hurt me, because he started to fall into dark thinking and he didn't think I wanted to be with someone like him, even though I did not make him feel this way.
My point, fix all you can fix about you, while you hold on to her, she will see that your are not willing to acknowledge her weakness. Remind her of her importance to you, and dig deep. Pray for God's direction he wants you to come from, as well as pray for her to be open to him and you. I wish your marriage the best. God bless!