Oh goodness, you've both been through the wringer, haven't you
?
It sounds like you need to find a new vet. This one is giving you conflicting answers and that's just unacceptable, especially for the amount of money she's probably made off of you.
I would imagine that a bland diet could be achieved with white rice and maybe some salmon or ground bison (sold in most grocery stores, even Walmart carries it now). My girls can't have chicken either, so if they need a bland diet I usually just give them white rice with the bison. Anything whole grain is probably not a good idea (so the oatmeal would be out) since it's harder for them to digest and the idea of a bland diet is to give the digestive system a break while not starving them. You could even try mashed plain white potatoes too.
I hope your baby gets better quickly
