Cat has upset stomach and runny nose?

Ur cat needs to go to the vet right away.. Hope he is neutered and an indoor pet, if they go out they constantly catch sicknesses, (many fatal), get injured and killed... take care of this right away it will not go away by itself but most likely can be cured with the right medication.. Cat "colds'" are not colds like we get that go away on their own. And if a cat does not eat or vomits they can quickly go into liver failure and die. Good luck.