Sorry, Sid honey. Hope you feel better soon.
I don't know about c. diff in dogs, but in humans the standard diet recommendation is bland, soft food that's not too high in insoluable (spelling?) fiber. So, no cayenne pepper or watermelon seeds. I don't know anything about how many protein sources are best, but again, in humans, I don't think that's a common restriction. Some nice lean boiled chicken sounds fine. Oat fiber is supposed to be more easily digested than that in rice, I think. Chicken and oatmeal? Bananas? Applesauce or stewed apples without the peel?
Some people who have had antibiotics have a temporary lactose intolerance.