I am so very sorry to hear about your father passing away. I know it is devastating. My father was diagnosed March 6th - given a year to live - and passed away on March 28th, the day after his first chemo treatment.
It is okay to feel angry and cheated out of every missed day with your father. I hope that for you it doesn't take too long until your focus shifts back to every day you did have with your dad. What saved my sanity is believing that although God's grace was not the outcome I wanted, it was the right outcome for my father.
I have to believe in my heart that he, along with your father, are in a better place - where they are no longer suffering from this cruel, heartless disease.
My prayers go out to you and your family during this unimaginably heartbreaking time.
Tracy