Struggling with Illness and Burnout

I've been ill for over a week with what I think is some nasty seasonal infection. I haven't been able to do much due to the fatigue, brain fog and feeling really unwell. Really I needed some time doing less as I was/am still in burnout, and I have enjoyed spending all day playing video games and/or watching stuff, but it's hard as I'm stressing quite a bit about all that I've fallen behind on and all I will eventually have to do (life admin, cleaning, etc). Also worrying about how long before I'll recover and my mind often jumps to worrying it's something more serious, even though I know there are lots of people are getting unpleasant infections at the moment.