The antibiotics are to keep this infection from becoming a bacterial infection. It sounds like it's past the "wait it out" stage. Its likely stress induced just from the move and cheaper to treat now than later. One trip to the vet should do it! One office visit fee and one prescription! The medication fox-gal mentioned, I know a LOT of the rescue groups here in the boston area were doing for a long time but haven't heard of this for last few years- probably because there are cheaper "drugs of choice" out now (Zithromax, I think is the big winner of late...). Shop around and keep us posted! Appetite loss in a cat can be a BIG deal, as others have said! so keep on doing what youre doing in the meantime!