Rose, I really hope something works out for you in terms of help.
I don't have anyone to look after. My problem is being a shut-in because of my mental health issues. I fight that. Not being able to get out for any length of time, like you are experiencing, has a terrible effect on a person's well being. Speaking from my own personal experience, it does far more harm than you ever realize at the time. Each day isn't so bad. But the cumulative effect causes awful problems.
Like with Crypts, I would not presume to tell you what to do. But would you please consider some more that you are asking more than is reasonable of any person. I know what it's like to keep thinking, "I've got this. I can do this." But being cooped up with just a single person is still isolating. You know how much better you feel when you get those breaks.
Sorry if I sound like I'm lecturing. And I know your choices are very limited. Please consider this some moral support.