Thats exactly my cats problem only we spent 5000 on an op that did absolutely nothing! These vets, sometimes I wonder... They said its common, she is a little better feeding her tiny bits at a time and of this specialized food especially for allergies, nausea etc but she still gets sick sometimes more often than not..
My thought is she is actually starting to go delusional. How do you know when its better to put her down. Its enough to kill a human with this stress!