I have lost both of my parents. My father when he was 59 from a heart attack caused from a blood clot from a medical problem that was not diagnosed correctly for years.
My mom died from cancer that was at stage 4 when it was diagnosed. It was treated and she lived about 10 months that was not of high quality and died at age 79.
I don’t know which was harder, maybe my father because it was unexpected. I just thought to myself that everyone dies and the time is not up to us. Both left a big hole that took maybe a year to start getting over. Just know that you will come to accept the outcome, but b patient with the time it takes.
I will keep your father in my prayers and I know he will be in a better place.
My parents died from the exact same situation but at earlier ages.
My dad was initially the bigger shock, but after watching my mother deteriorate from the cancer, that was actually much harder emotionally.
The rest of your post is spot on.