I am not saying that you are responsible for her actions. She is and she has to take that responsibility. As Jake said, she had other ways of handling her own issues before things got to this point.
Take responsibility for your own actions and reactions. Learning to handle your emotions in a better way will take time. At this point don't try to connect with her. Connect with yourself and your children.
Use working on the house as a way to rebuild yourself. Both are going to take time, but if you put the work into it, I think you are going to come out stronger just like the house will.
She has to do the work on herself and then you both can work on the marriage.