Awwww, poor Timmy. 
There are viruses, (calicivirus for one) that have no vomiting, diarrhea, or sneezing, but can have fever, loss of some appetite, sore joints. It is a virus that can come in with your shoes (or bare broken feet). It can anywhere from severe to mild depending on the kitten. It may be a bug that just requires supportive care and will have to take it's course.
Sending some  that he perks up soon.
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Cat maid to:
Rose semi feral, a cpietra rescue, female tabby (approx 13 yrs)
Jasper RIP (2001-2018)
Sweet Pea RIP (2004?-2014)
Puddles RIP (1996-2014)
Snowball RIP (1991-2005)
In a cat's eye, all things belong to cats.-English Proverb
“While we are free to choose our actions, we are not free to choose the consequences of our actions.” Stephen R. Covey
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