While I cannot know exactly what you are going through I can empathize. It must not be easy. What your sister did was not good. You are a very nice person to have given her child a home. Loved him as your own. I am sad to hear that you cannot have children as well. I myself know how bad that must feel. I had to have my uterus removed as well. It was horrible. You need to be strong however. Do not just give up hope otherwise it will never be fixed. As for getting pregnant there are other ways. There is adoption or surrogacy or IVF. A lot of other ways just explore these avenues and stay strong I have faith you will pull through.