I too think the feelings you describe have been made worse by the pandemic and the lockdowns.
That said, when I have felt down and that nothing was happening and been worried due to DH's health, I found that structuring my day and week helped.
Not minute to minute - that would drive me mad, but my day looks like this:
breakfast followed by washing-up and bedmaking. Once or twice a week, as needed, I dust bedroom at same time and or hoover upstairs. Morning gymnastics (ten minutes or so of a programme that suits me and which I vary in the course of the week.
The rest of the forenoon is given over to one specific household task, depending on the day of the week. (Washing, ironing, hoovering, getting bins ready for emptying the following day etc.)
Afternoons are my time off, where I read Gransnet, write e-mails or letters, check Facebook, sew, read, etc.
Unless it is pouring I go for a walk every day.
I let myself say "I can't be bothered with this task today," but it has to be done before the weekend.
This way I avoid the house getting so messy that I can't stick it and I don't wear myself out doing all the cleaning at once. Same applies in garden, which is far harder as I loathe and detest gardening.
You may of course have read this far and thought, "Good heavens, the woman is mad. I can't live like that!! but I found it got me through some rough patches.