G'day muse and welcome aboard from the land downunder!!
Thanks for telling us a little about where you're 'at'. You will have much sympathy here.
For myself I can truly say "I know what you mean" for I too have experienced something like what you are experiencing. Sad to say my Dad died in the op and we were left to confront what was unnecessary grief.
One thing that helped us was to think that dad made his choice - in faith. He'd lived a good life - after all, he raised me!!!! - and in the end we know we all must die. It's inevitable, after all. It seems to me that just as we say that faith is personal then I guess we must accept that our nearest and dearest have the right to make decisions in accord with that belief.
But it's still a waste.
Hopefuly yourfather may be spared a while longer. I hope so and wish you the best.
Cheers, Ozzie