Sorry to put a downer on you, but if it's the same that the boys had it takes at least a week to start feeling better - go off sick and rest - you won't have any choice - don't bother trying to eat - our boys didn't have an appetite for over a week and are only just now getting back to normal eating-wise.
Just sleep as much as you can and drink plenty and do as little as possible.
Fingers crossed it isn't that and you'll feel better soon, but keep up with the paracetamol and brufen/nurofen as well if that's not working on it's own.
The temperatures are a bugger!