I think we've more or less moved past the point of your original thread now OP, and those that have read your post in full, just want to suggest ideas to help. From your latest update, I think that those that have suggested that you just try and sell your house as is, might be right, so would it really hurt to get an agent in to give you a valuation, even if you're embarrassed for them to see it, you need never see the same agent again, and at least then you'll know for sure, whether there is any chance of selling it and buying something cheaper. I know you say there isn't anything cheaper, but what about a flat, might that be worth thinking about?
You said that you might perhaps be eligible for some grants now OP, you also mentioned some health problems, might you be eligible for some benefits that you haven't applied for?
I did ask whereabouts in the country you live but you didn't respond, the reason I asked, is that in some areas there are community organisations, that take in things like part pots of paint, used timber, and stuff like that, and then sell them off really cheaply to encourage recycling. I just did a quick search and found this website, you might like to take a look, and then perhaps see if there's anything in your area that could help. https://communityrepaint.org.uk/the-uks-paint-reuse-network Also, it might be worth checking places like Freecycle to see if anyone is giving away stuff that you could use to improve your home, and of course if you put a 'Wanted Ad' on Freecycle for things like paint, I think it highly likely you'd get lots of offers from people who've bought too much and don't want to store it. Maybe you could get your son interested in helping paint etc., if you're not well enough to do it yourself? As far as replacing your kitchen units, again, it's worth looking out for second hand kitchens, as lots of people change a perfectly good kitchen, when they move into a new house, simply because the one that's there, isn't to their taste. I hope if nothing else, I've given you some ideas.