Hi DizzyDee,
I think medicine, like so many other things in life is not an exact science. Many of us struggled with symptoms for a while, before being diagnosed. Anger is a natural response to a cancer diagnosis - as is denial, then grief then acceptance of the diagnosis. I think the best thing to do right now is gather as much information about treatment options, prognosis, pain management, financial assistance - all the nitty gritty so to speak as best to help your dad and yourself - and just be there for him - this is a great place to start. A great place to voice your emotions, to vent, to ask for help or just discuss things in general. Cancer is a huge rollercoaster ride that is completely different for everyone that goes on it. So best to get as much information as you can from the cancer council and your dad's doctors from the get go!
Just letting you know that I am thinking of you,
Nicole