Bahbah, is it worth calling the vet to find out what you can make at home for your cats until there's some kind of all-clear?
It's a hassle,but your cats are part of your family.
Yes, it is well worth it.
Actually, I have a friend who has been doing this for years (she's a bit on the nutty side when it comes to health and nutrition, but she researches thoroughly). I remember some of the things she said, but I'm going to call later today and get a refresher.
I'm concerned about the affects of a sudden big change in their diet as well.
Pureed canned tuna fish and white rice in those proportions should be fine for a short term fix.