I'm very sorry for the ordeal you're going through Randy. Three years ago my wife had similar symptoms and had testing done for the cause. Her aortic valve was failing due to radiation therapy 24 years ago, for Hodgkins. Her valve replacement went well but the radiation also affected the capillaries in her chest and when an infection set in, she had to have her sternum removed. It was a long and angry road. She thought she had conquered the disease decades ago only for the treatment to come back and do this, almost like it was still there.
I hope there is something that can be done which will bring many more years of happiness. I asked Becky's doctor if I could get another 300,000 miles out of her and he said there's a very good chance!