Take rest. Nothing is more important than your health

You just can't do well with fever.

Look at how I dropped after taking a shot of the covid vaccine (I'm under 18 so the side effects were stronger and lasted more, even up to now).

Health >>>>>>> Anything in the world

Yes,health is important, but can't accept to fall for fever :)

Since you have a high fever then it's better to take a rest...
You can still participate contests after the fever, but you can only live once.

If you want to fight and possibly destroy your health (like myself) here's an alternative answer.

I had the worst flu during IOI 2013 in Australia and that was also my best performance at any IOI. Maybe I would have had gold if it weren't for the flu? Who knows... I think I was given 2 pills of Ibuprofen and 2 pills of Paracetamol (don't know how many milligrams though) not long after the start of Contest Day 1 by the onsite doctor. They lower your fever and reduce pain for a few hours and they made me feel well enough until the end of the contest. Of course, consult a doctor before taking any medicine but these made the contest manageable for me.

Funnily enough I also had the flu during the IOI selection contest in Serbia that same year and still I ended up being first. I was accused of doping — as a joke :D

Your best choice is cold enema!

ps. First I thought of paracetamol, but it’s bad for liver and it looks like you are fond of masochistic practices :)