tonka...
Do not begrudge yourself your thoughts, they will be many and varied, however, the questions of fate, faith, etc. will probably best be explored later when you mind is more at peace. Now is not the time for big decisions or proclamations.
Peace is within your grasp. Being real, caring, loving, for both you father and for the others that are sharing your experience. By all means tell your father everything you want to say. I have done this more than once with my father, when we all thought the end was near and again when it was the end. How lucky I was to have the chance.
Please remember that not all communication is verbal or visual. You are putting off "energy", and people are receptive to it. I know it sounds like new age BS but it is true in the electromagnetic sense. Communicate, do it with feeling, you will not regret it and there is no down side.
I shared the same thoughts you are having about when the suffering will end, but at the end of the day the end came at the right time for him when he was about to lose most of his dignity. I am not made of the same stuff as he, I never would have made it that far. Forgiveness? Those are thoughts for another time, seeing you well and you being well is what matters. We have all carried our burdens.
My thoughts are with you in your time of need.
Pekkerwood