I am really sorry to hear that your father is so ill, Stephanie. I, too, know what it is like.
I lost my father 9 years ago ~ and those days when I knew that he was so ill, and I could do nothing to help him, were awful.
I still miss him, but he is still part of my life.
I hope that your father's doctors will be able to make him well again and I hope that you and your family will have the strength to support him and each other, whatever the outcome.
Take care.