Being bound to a chair isn't all bad; you eventually get used to it. But it leaves you dependent if you can't load or unload a mobility chair. I know the fear is weighing heavily on you. There are businesses that hire caring people to come to your home and help with chores, shopping and even personal care. Check into that, too. I hate that you are having such horrible pain.
YOU may get suggestions from your Bishop. I know they used to have counseling for Members. It might not be so any more. But it's worth a try.