Thanks for the antibiotic information. The pilling is going much better now that I have help. The new problem seems to be that the Clavamox is making him feel awful. He's been sleeping alot and when he does get up he looks out of it. I googled it and found some sites that said Clavamox can make cats feel nausceous. Pepcid AC was recommended to help combat that so I'll ask my vet if that would be okay to give him.
If the pilling starts too become to stressful for him though, I'd definitely like to pursue the antibiotic injections.