Luckygirl I don't have personal experience of what you're going through, but I have a friend whose husband has MS and she's just had her second knee replacement. She tells me she finds it difficult having people in her home most of the day. They don't live in, but a male carer is there all day. He has a hoist to get him in and out of bed and a sling to get him in and out of the shower. loo etc. She is tiny so can't lift or move him very far. Two ladies come to clean and change the bed, etc. When the weather is good, the male carer takes him out, but sometimes for days on end there are the two men in the lounge watching TV and she feels like a stranger in her home.
The problem is that when they've all gone, she has to cope alone. He may have soiled the bed and she struggles to get him out and the bed changed and him back into bed. He kicks up a fuss and can be very aggressive with her and resists her having the respite weeks she's entitled to. She's exhausted and depressed but says she can't cope with the guilt of putting him into a permanent care home.
You need care at the moment. You must get your own health issues sorted. You cannot go on being in pain and providing care for your OH. When you're feeling better, things will look different and you will feel better able to cope. Live in care is intrusive, so is there not a short term arrangement? It's not his fault he's so sick and I know why you might feel guilty but it's not your fault either. No need to feel guilty, it's what is practical that matters.