Worries about my 4 week old?

Orion turned 4 weeks tomorrow and he is sick. I was up with him all night last night. He has a cough, sneezing, and he is really congested. His mucus is a dark yellow color. He doesnt have a fever.. his temp was 99.4 rectally. The docs office is closed today because they are moving to the office next door but I have a call into them for the doc to call me back. That could take forever. What can I do in the meantime? I have been using the little noses drops and suctioning everything out. Oh he also has a little rash on his face which I know is common in babies that have a cold or other type of infection... the thing im worried about is RSV??? I think thats what its called. I read online it usually shows up between 4-6 week olds and he is 4 weeks... also im worried about the dark yellow mucus being an infection like pneunomia or something.. Gosh I hate the internet!! Whenever you look up what you can do for symptoms it always has what it could be and RSV and pnunomia showed up now it got me all worried!