I am looking for advice regarding my 1 year old ragdoll cat who occasionally gets sick for no apparent reason. About once a month my kitty will get sick where she vomits, has diarrhea, lethargy and overall acts depressed. She has been to a few very reputable vets where they have done exams and complete blood work finding nothing abnormal. When she becomes sick, it usually lasts about 3 days then seems to snap out of it and be back to normal. She is on a very expensive Gastrointestinal vet food which has helped a bit wit the frequency but i just feel so sad for her when she does become ill. Any suggestions would be greatly appreciated!