A. I’m very sorry to read of your predicament but I don’t think this is strictly a situation for Buddhism, at least in the short term. Buddhism is about learning about yourself and the change that takes place on that journey. That change should cultivate inner strength, so that we become the master of our situation rather than its victim. In a situation like this you become master in the sense that you don’t allow yourself to be the abused, but rather have the courage and inner ability to become emotionally detached from the abuser and take charge of your own emotional experience. Inner strength gives us the ability to even walk away from the abuse and maybe start completely anew. This usually takes years of practice. I’m afraid there’s no quick fix in Buddhism.
During the time of developing this inner strength through practice, one of the skills (upaya) we learn in order to help us through life is to employ other (external) measures, as and when needed. In this case I would employ someone outside of the situation to help, like a counsellor, or someone skilled in emotional abuse situations. Sometimes our experiences are just too powerful for us to deal with, and a part of Dharma practice is to admit that things sometimes are just too big for us right now. To acknowledge this truth can be a big step forward.