Wishing you and he all the strength for the journey ahead, come what may.
You may find this recent thread, and the ones it references, helpful. Many of us have lived through what you’re about to. It might sound premature from your current POV and for your current hopes. But it is worthwhile to consider the aftermath, before it becomes the aftermath.
You may, sooner than you had planned, have to choose between helping your father to die in peace with dignity or to keep him alive in misery for another week, month, or three so as to postpone, but not prevent, your own pain. It will take a great deal of wisdom, insight, and unselfish love to place your father’s best interests above your own. May you have that strength and wisdom if/when that time comes.
Peace be with you.