You will get through this, I promise you that. You'll find strength in yourself that you never imagined you had. I sent you a message, but also wanted to post. My heart goes out to you. I remember all these thoughts all to well, your not alone. I remember vividly saying that I would give up my life for my boy to live if it was at all possible. I never knew I could love so much. Remember that your boy loves you and that your doing what is best for him and his family. What will happen will be right for both of you.
Take it one day at a time, get the amnio results to know what your dealing with (the first ones could come quickly), and go from there. Make sure to ask a lot of questions to understand what is happening and all the options that you have. Don't let them pressure you or push you, but know they do have experience with this stuff. It's overwhelming, that is for sure. xoxoxo