Very sorry for your loss, as much as you are "prepared" you never really are.. this probably hit you like a ton of bricks with the heartbreak and such a loss.
Wife is 69 & I am 74, we have had long talks about the "end" and as much as we are prepared, sometimes when I am alone I know the end is coming, and it brings a tear. As much as I think we have covered all the bases nothing will compare to the eventual loss.
I can't imagine your loss.. but my thoughts are with you. Peace.