OP, can I suggest that now that you've resolved the argument you had with your DS, that you perhaps try to mend things, by inviting him and his fiancee to go OUT with you for a meal - your treat, if you can afford it. Tell him you've realised that you've slipped into the habit of expecting him to do things for you because he lives closest, and used to look after you at home, but you've realised how unfair that is on him, so have decided that it's time to make a fresh start, and you would like to him and his fiancee out to dinner, as a thank you for all that he's done for you in the past. This might just be a way of drawing a line under the mistakes that you've made, and re-setting your relationship with them both.
Just a thought, I'm an older, disabled woman myself, and when I was growing up, we had a neighbour, who everyone avoided, because EVERY time someone said, 'Hello, how are you' to her, she would say, 'oh, I've got so much pain, I can't walk, blah, blah, blah'. She was one of those people who didn't seem to realise that when people ask how you are, they're just being polite, but don't really mean it, and certainly don't want your ailments gone through in detail. Having seen how everyone avoided her because of this, when I became disabled, I made up my mind to avoid talking to people about my ailments, when they ask how I am, so I just tend to say 'I'm fine thanks, how about you?' Could it be, that because you don't get out much, and are lonely, that you have slipped into the habit of doing this? Have a think about it, and be honest with yourself. Then, think about what you can do to make your conversation more interesting. I am lucky enough to have a wonderful DH, and we happily spend most of our time together, because of this, it would be easy to have nothing fresh to talk about, but one way I've found, is to chat with him about some of the subjects that come up on Mumsnet. I tell him about the funny ones, some of the serious ones, etc., and it's often interesting to get a man's opinion about a particular topic. I also try and keep an eye on the news, so that there are things to talk about there, and when we meet other people, I make a point of asking about how they are, what they've been doing, etc., rather than concentrating on talking about myself. Maybe give this some thought, so that you don't always talk to your DS about the same old things. Just my thoughts, but maybe they might help.