My turtle isn't eating!?

I have a sick red eared slider. He has a respiratory infection according to the vet I saw. He's been on daily baytril injections for a week. I know baytril causes decreased appetite, but I'm worried because my turtle doesn't eat at all. I offer him food every day and he ignores it. I've tried a variety of food (turtle sticks, small fish, spinach, etc). It's been over a week since he's eaten anything. The vet told me it's ok for a turtle to go a while without food and that once he does start eating i'll know he's doing better. I feel like it's been too long though. Help! What should I do?