I just adopted my kitten last week from an organization. They warned me he had a "little cold" and so i made an appointment, took him to the vet and have now been giving him medicine. My concern is that he doesn't seem to be getting any better-he seems just as congested and he has a horrible cough! The vet has told me that it's too soon to tell and that I need to give it a few days; it's already been 5 days since he began his medicine. Am I over-reacting?