Cold in 2 monthold HELP

Destiny

My poor baby boy has a cold. Hes been coughing and you can definitely hear mucus in his throat. I'm constantly sucking out snot from his nose. And it still gets stuffed up. Hes so cranky when usually he's a very happy baby. He's also sleeping all day and night when normally he wakes up a bit during the day for a hour or so. He sounds so terrible. Hes almost two months old. I brought him to the er Thursday they said theres nothing they can do. And now its Sunday and he sounds way worse. I'm calling his pediatrician tomorrow morning. But what can I do until then ? I'm worried hes breathing to fast also. Hes so stopped up he has troble breathing.