Yeah, I can really relate. Dad will die, there is no answer to why, and you go the rest of your life with that unsolved equation. It is one of the great mysteries, and it allows for no comfort. I guess that acceptance isn't always comfortable. I know that I no longer OBSESS about why, but I still ponder from time to time. That is a relief, as I used way too much energy obsessing.
But you know, I guess it is just okay not to know. I am still much stronger today than I was, I am happy to be me, and I am glad to talk with you all on this forum. It is helping the healing process along, giving me much strength and courage. I am so grateful for the Internet, it lets you know you are not the only one dealing with things.