I´m very sorry for you. You wrote that he was pretty healthy until some time ago?? Then this must have felt like a someone punching in your stomach, right??
I´m also kinda scared that I will get cancer at some point in my life as well. You should know that this was sadly not the first case of cancer in my family, especially my fathers side is affected by this. Both of my grandfathers had this kind of cancer as well, they didn´t survive. One of my aunts (sister of my father) died in 2018 due to esophageal cancer and her son (my cousin) is having testicular cancer.
I´m sometimes really wondering why this sh*t is happeing to my family?? What have we done??