remove all clothes and sheets - honestly it wont hurt, my friend who is a paramedic said when ever she is called to babies with temps they have clothes on, first thing she does is remove everything exc nappy.
leave naked until temp decreases, if nothing happens lie him naked on towel, cover body with light towel and leave one limb out pat with flannel/sponge of tepid water, repeat all over body but cover what is not being done - this prevents shivering, open his window too
calpol and nurofen works well.
my dd had throat infection (didnt know but was cause of temp)at 15mths.
calpol would not get her temp down, second day doctor advised me to get nurofen i gave it two hours after calpol and at one point had to give it 5 mins after after speaking to emergency doc in middle of night.
her temp just would not budge, i had to keep waking her and giving her calpol/nurofen throughout the night, third night it went over 40 sohad to take her to hospital, they had one look at her thriat and said she had infection, i was given an antibiotic, after second dose she was completely back to herself, stupid doctor three days previous never checked her throat when i brought her in!
dont feel silly, go by your own tutition, if it wont go down, call emergency doc and they will talk you through it.
like someone else said temperatures means the body is fighting something buts is always best to be on guard.
make sure he is drinking plenty of water.
hugs