Might be feline distemper http://en.wikipedia.org/wiki/Feline_distemper Any
blood in the liter box?
 
Is he drinking? You could always put some straight CS in his water dish too.
Or syringe it into his mouth. 
 
If you know how to hold him by the scruff its not as hard as it seems. One
thing is to place his lips over his teeth as you do it. He will be less
prone to bite then as he is biting himself at same time. Works well.

If it is worms or tapeworms then over the counter cat dewormer might help.
 
Lots of possibilities here.


  _____  

From: Fuzzmom [mailto:[email protected]] 
Sent: Wednesday, August 19, 2009 11:59 AM
To: [email protected]
Subject: CS>Cat Won't Gain weight


Hi..thanks to everyone who gave me advice on my finger..it's doing a lot
better. Now I have a Really serious problem..he's a 5 or so month old kitten
i jsut tookij. He's  a great little meowy but he won't gain weight..in fact
he seems to be losing. I don't have money for the vet..the pound..well you
know wha they'll do..can cs help? He was eating a little with tuna now he's
not even doing that. I don't know what's wrong..I thought worms but he
doesn't have the big round tummmy you see with them a lot of times. Could he
be annemic? he eats but doesn't seem tobe absorbing..pllease help! and he is
afraid and fights if you try to use a syringe..he bit one in 2. Please any
advice would be great..including what people might have used..and any silver
dosage or flavoring tips to make medicating him easier. Or is silve not what
he needs? I just want t o help him. Thanks.