My cat has been having diarrhea for quite a while but now it's worse. She keeps going to the litter box and just squirting it out. Very foul smell. I'm thinking it's IBD. She's been to the vet many times and all test were ok. She's now on predisolone for almost 2 weeks but it's not working. I'm looking for something to give her a little relief. She can't take flagyl.