A. Your cat is certainly undergoing a lot of changes at once which could be causing some digestive upset to occur. If your vet did not recommend the food change, it is a good idea to stick to your current food while your cat continues his or her medication and probiotics for a period. If your vet recommended the change, foods should be switched over a period of a week to prevent digestive upset. Gradually add in more and more of the new food while decreasing the old.
If your cat continues to vomit, he or she may also not be reacting well to the medication or probiotic given. If the vomiting happens more than once, it is best to alert your veterinarian so they can determine if it is safe to continue or if you should change medications.
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