My 7 1/2 year old cat has had diarhea and vomiting all summer long. It started after i changed her food but has not stopped. My vet has done numerous tests, stool, blood, sonogram and xrays and can find nothing wrong and has diagnosed IBD. She prescibed prescription diet i/d dry food but my cat wont eat dry food since getting sick. She barely eats wet food and when she does she usually throws up. She has lost lots of weight and im very concerned and distressed. The vet also prescribedMetronidazole which didnt help and steroids which havent helped either. Im at my wit's end. Please help!