Liz Buchanan BVSc MRCVS
Hello! I have rewritten this for clarity. A week sounds like a long enough to me; it is definitely already a good time to be talking to your vet already. If you are in the UK, vets appointments may take a while to get at the moment, so the receptionist might ask questions in order to triage the situation (to figure out how soon the case needs to be seen). Reducing stress can help with respiratory diseases, but keeping them in may be helpful to other local cats, if it may be infectious, so there is a trade-off between these two things depending on your individual cat. Wet food, or soaked dry-food, may make less dust than dry-food, which is better for the respiratory system. It may also help to increase water intake. Steam-rooms can be useful, but only providing that they don't stress the cat out. Wishing you luck and please do let us know how you get on, and if there's anything else that you later wish you have known.