Like u said he was too young to be adopted, so he is missing his momma and any litter mates he had. Kittens should not be taken from their momma until they are around 12 weeks old. He is lonely and probably scared at being by himself and in a strange place, with strangers. would u spray a human baby if it was crying? I would also not put flea stuff on a kitten without talking to a vet first. That would be a lot of nasty chemicals on a unaged aged kitten.
If u got a kennel for it, big enough for food water and a litter box he could then be in the bedroom with you.
It's really too bad u didn't give it a bit more thought before u brought this little one home.
~Friendship is like a bank account. You can't continue to draw on it without making deposits~
~Tegan 9 year old yellow lab~
~Wilbur 9 year old LH cat~
~Mirabelle 18 mos dsh~
~O'Shawnnessey 18 mos dsh~
~Darby 1 year old dsh~
~Mindy 7 yr old shih tzu~
~Dexter 10yr old Salmon (large goldfish)