You certainly have my prayers. I lost my father in December to cancer. He suffered for over 2 years. It truly is unimaginable what you’re going through.
Jesus loves your father as he does every one of us. Peace and comfort to him and your entire family.
My FIL just died from cancer at the end of September 2013. He was only diagnosed early July. It was a blessing and horrible to have it happen so quickly.
I lost my mother to inflammatory breast cancer November 18th so I’m in the same boat. My condolences to you and yours.