Well this has just got to be the worst thing about lone parenting. My DC are pretty much constantly getting virus and me too, more and more. I've never had any family to help or an ex so I just literally have to crawl around the house, to look after DCs basic needs and get through the time.
Worst of all is when all three of us have flu with D & V - like happened earlier last year and many times before that too. Then, I not only know I can't rest during the day but I'm also going to have several sleepless nights too, mopping up children's vomit from all over their beds, putting on laundry... and the second I finally drop off to sleep, delirius and with high temp myself, the other DS wakes up vomiting - and so it goes on.
This is really the closest to torture I have had in my life, to the extent, I become almost phobic about one or other DS getting yet another virus and constantly monitor them neurotically for symptoms!
Now my twins are 8, they can at least do some of the basic self-care themselves, if NOT ill and leave me to 'die quietly' for up to half an hr before fights breaking out yet again . It was impossible though when they were v small....several times I'd be unfit to look after them - delirius, vomiting, too weak to walk and yet be at it, 24/7 with no sleep, feeding them every 2 to 3 hrs with no breaks...Never seems anyone available to help out.
Makes me sweat just to remember...but appreciate also how much easier it is now they're 8. They also know now that they'd have to phone 999 if I collapsed and they couldn't wake me - whereas in the past, this was my worst fear.
Like others have said, your DCs will survive on the basics for the few days you can get by and at least you have a DH to help at night. I also run my own f/t business and can't really take any time off either, without dire consequences to the family finances - so have also had times when I'm really sick but get the children to school, work all day with no break and then do all childcare all evening too, hoping I get some sleep at night.
This sounds so depressing, I'd better stop now and celebrate the fact that we're all healthy and well right now. Hope you recover too soon.