Seventeen year old tabby and white spayed female. Blood and urine came back normal. Weight is good. Coat is good. No appetite. Drinks like a fish and then spends the night vomiting. Any suggestions? X-rays showed nothing abnormal. Can't afford an ultrasound. Treating with metronidazole (sp?) a limited diet (Natural Balance Duck and Green Pea) curcumin and kelp. She is exclusively syringe-fed. Food is staying down. Anyone seen this before?