Floria, you sound remarkable. You're most certainly not being grumpy!
I agree with Marionk. From what you say I think it's really more to do with concern for your husband (congratulations on the near half-century btw!).
A strange side effect of worrying about/looking after someone you love is that you can become utterly convinced you look like a scarecrow when in fact you really, honestly don't. This might sound a bit mad but I'm convinced it's do with very deep emotions actually changing what you see. Fear and exhaustion can make us see things in the mirror that simply aren't real.
This has happened not only to me but to friends as well, which is why I feel I can write about it as an actual (and sadly ignored) sort of emotional phenomenon. I've been the main family 'caregiver' (dread phrase) since I was in my teens and I can't tell you the number of times, over many decades, I've been convinced 'God I look old' but on seeing photos I realize ... I actually looked quite good! Friends in the same situation have believed that they're wrinkling, sagging, etc. when in fact they might look a bit pulled down - sometimes not even that - but no worse.
Funny what love can do!
Of course it would be quite natural if you were to age a bit, going through something as daunting as this. But considering your activities and interests, I really think this might be a case of what I can only think of as 'CCSS' - Concerned Caregiver Scarecrow Syndrome! You probably look much better than you realize. It's probably feelings - dratted things! - affecting your vision!
Really hope I'm not stepping out of bounds if I say it sounds like time other members of the family pulled a bit more weight. That sounded much harsher than I meant it to. When a family is blessed with a wonder such as yourself, it's quite easy - and a complement in a way - that they just assume you can go on being a wonder under any circumstances. But this is the sort of thing where children are really meant to help out. Please forgive me if that sounds horrid. If you don't want their help, that's different. But if you do, please don't feel you're being weak - just tell them. Otherwise, what is a family, really?
Try not to pressure yourself, give yourself a treat (amazing what a bit of chocolate and a Jilly Cooper book can do), and remember that mirrors can distort as much as they can reveal.
Re. being called 'dear' - it's soppy and pointless, but how I miss the days when nearly everyone regardless of age was 'love' or 'dear' or 'duck!' And the chaps in the street with 'Alright, darlin'?' Ah me ... I seem to have gone off topic a bit!
Best of luck to you and your husband. I look after my Mum, whose most serious current condition (out of several!) is cardiac, so, platitudinous as it may sound, I can vouch for the fact that it really is remarkable what they can do these days. And we of the, er, older generations are frequently stronger and more resilient than the young 'uns! Hope all will be well.
I hope that works; I tried to do flowers!