Thank you for taking in this precious boy and making him your own! : )
When the vet tested him for feline leukemia, do you know if he was also tested for FIP (feline infectious peritonitis) and FIV (feline aids)?
It's possible that his symptoms are being caused by a viral or bacterial infection and the newest course of antibiotics may do the trick.
According to his symptoms, there are a lot of possibilities to be considered and I think you'll find the website below, helpful:
http://cats.about.com/library/weekly/aa040799.htm
I hope your cat is back to himself very soon and please keep me posted on his condition. Thanks!
Cher
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