There is always a least a little hope, from my experience anyway. I'm not trying to say our experiences are the same, given that I'm 18 and you are older than I am, but there is always something little that comes up. Like a pretty sunrise. I worry a lot about my pets as well. They expire me grief as we do, they are sad. As for the misfortune that's happened, what are your options. If you don't mind me asking, could you go into retirement? And if you do find a new job, is public transport available to you? Maybe if you live in a town you can find something close enough to walk to. Or you could start a small business, like having a small garden and selling stuff.
Shaking and memory come with age. I shake really, really bad but that's because of my anxiety.
Regardless, I'm not going to encourage you either way, I just think that CBT should be used as an absolute last resort and somethings telling me (maybe it's your fur babies, haha) that there is another option.
Much love, I hope I was kinda able to help. I kinda threw a lot of info at you at once.
xx!
experience* sorry, I don't have my glasses on.
But I did want to add that you aren't useless. You are your own special and unique person. Even if you don't feel like you're doing anything important, you are your kitties life. That's something very NOT useless. They need you.
Whatever you choose, just be sure in your decision because it's a very permanent solution. <3