This time last year OP my Dad was dying in a hospice, after 6 months of cancer that had me questioning my own sanity by the end of it. The aftermath was almost worse, having to clear his flat in 3 weeks, family objecting to where we wanted to inter his ashes. By June, I think I was the frailest I've ever been and gave in to the inevitable "I just can't do this any more". Had a week off, cried for most of it, and let the grief hit.
My honest answer is that whatever you do, you'll question it. There is no right or wrong - you just muddle through the best you can with the best of intentions. And somehow, you come out the other side.