Wayne,
Hang in there. Try not to panic. My Mother (86 now) was diagnosed with Lung Cancer 2 years ago, and had 1/4 of lung removed.. She is still up and running. Devastating yes!!! Always doom, No!!.
Take care of yourself, and take it one day at a time. Prayer helps.. Send cards, letters...love to Dad. No guilt that you need to take care of yourself before you can go to him.
I am sure he will understand. Thinking of you.