I have seen what a nearly-but-not-quite-fatal stroke has done to my mother's life for the past 8 years. It is a constant source of pain for a lot of people, most of all, for her. She wishes she would have died and so do I. She is now stuck with a pretty healthy mind but in a body that has robbed her of independence. Having your kids wiping your rear end is humiliating, no matter what assurances she receives from us.
As I said, this should be a private matter.
It is. Between each person and God. Who does not tell us that we will not suffer humiliation, dependency, utter unfairness. We are not here for the sake of convenience. We are indeed made in G-d's image, and if we can't trust in him to bring us through, then each and every apostle died a fool.
As I posted earlier, I have a friend completely crippled and pretty much dead weight from MS. But she has spirit and joy and wants to enjoy what she can. Her family took her on the "Pirates of the Carribean" ride at Disneyland. There were many patronizing looks, "Poor thing". She had a blast!