My cat is 14 years old and is not eating. I've brought him to the vet and he's had quite a lot of blood, urine etc tests. Nothing seems wrong. He had his teeth cleaned and was on antibiotic for a week, ate fine, and now won't eat anything. He acts like his mouth is hurting, but the vet says it looks ok. My other cat had bartinella, and was given antibiotic. Could this cat also have bartinella?