Wow, that's really good that he's doing much better on that food. As far as that weight gain...who knows...maybe he had some issues?....j/k
I have been talking to a couple of people that been experiencing extremely high vet bills lately...my suggestion to you is that you may want to take out some insurance on your little kitty. I have some sites here if you would like to check into them further. The rates are very reasonable considering the alternative! All vets, from my understanding, accept this insurance...Good Luck Sweetie..It's good to hear that he's doing much better. I pray that he continues on a very healthy road to recovery.
God Bless You & Yours,
*serves the US alsohttp://www.pethealthplus.comhttp://www.insurance.com
If you get stuck....just search the web "pet insurance" you'll find this is extremely popular! I had no idea!