Sounds like your mind is trying to find a way not to be the victum. The is probably the first step, as you go though therapy and start feeling stronger the dreams will keep changing. You will be protecting the child and eventually you won't dream about this subject at all. Talk to your t about how your dreams are changing and that this process is upsetting you. Perhaps your T has training to help you take charge of your dreams and Chang then while you are sleeping.