Lots of babies on here experiencing fevers at the moment, it seems!
Mine had one all yesterday and seemed pretty unwell (barely eating, cold hands and feet but burning body, shivering, breathing fast, upset, etc.) but is better today. She still isn't eating properly, though, and has big 'eczema' flare ups on various parts of her body ... we were thinking teething was to blame, as she is teething at the moment, but now I'm wondering about hand, foot and mouth as I've heard it can occur all over the body and LO's 'eczema' looks really blistered ...
I'd keep giving the Tylenol to keep any fever/pain at a minimum. We have been giving LO Calpol (infant paracetamol) every four hours. We also kept her undressed except for a nappy. She slept like this under just a light cotton blanket, to keep her comfortable. You can't really do much more than this, as well as obviously keeping a close eye on him and his temperature. I think most serious illnesses would usually be well in place after almost a week, and be accompanied by more worrying symptoms, such as vomiting, listlessness or refusal/inability to eat or drink anything.
You could try a lukewarm bath if he seems to be really burning, but this made our LO shiver badly when she came out, so be aware. She was fine after a few minutes, but it wasn't very nice.
As always, you know what is concerning when it comes to your baby. If you are worried, it's better to be safe than sorry.