My cat has a respiratory infection and was taking oral antibiotics but they were not working so my vet suggested this shot. She got a day and a half ago. How long will it take to clear this up? When she is sleeping she wheezes and snores so loud that I cannot sleep. Is this the right med for her? She is 8 years old and was born with this. I am worried because I thought I would see results during the day. Can anyone help me out here? Also is there a place on the net we can go to get free advice from a real vet?