Older himalayan frequently vomiting....need a remedy??

Cats and vomiting a sure fire standing room only lecture at vet conferences. If the vet cannot find a physiological problem, food and hair have been ruled out then it may well be psychological. At 12 years old he has had multiple traumas in his life and vomiting may be the behavioral response. If you are grooming, he is eating, drinking and pooping in the box he may just need a bit of time to adjust.