Myrnafaye when you say hair balls you means like the cat hairballs or food? Is he a long hair kitty? I'm trying for Mimi holistic vet to go together with the normal vet. If you can afford it go for it too. For vomiting also helped tiki cat food at first the chicken flavor but it does not have many calories so be careful and then probiotics helped too. Ibdkitties.net has tons of help on pancreatitis and ibd ! Give it a try.