OP, I’ve had norovirus a few times in my life and my god, do I get it bad. Exactly like you, fever, body aches, can’t even keep water down etc, it’s horrendous.
I got rid of it as quick as possible last time by not eating or drinking anything, as in, because I couldn’t even keep water down I just didn’t. I felt SO dehydrated but I knew if I did it, the bug would be starved/ dead the following day. If you have to drink, literally just enough to wet your mouth, that’s it, do that every few hours, just the smallest of sips. It does work and I promise you you won’t be throwing up anymore.
I really, really feel for you as it’s fucking awful and you literally feel like you’re dying.
This isn’t aimed at the OP or anyone in particularly, but it seem like there’s lots of it going round but how on earth are people catching it?! Schools/ nurseries aren’t open in England and most people are still distancing/ washing/ anti bacing hands etc and it’s ‘summer’ I thought sickness bugs were more dormant then too?!