Help really bad cough at 7 weeks

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My baby has a really bad cough that to me is getting worse. I called my pediatrician to basically be told if he don't habe a feaver or congestion in his chest there is nothing they can do.😔😒 I can tell it's getting worse. The cough sounds horrible, his noise all stopped up and has gone from eating 6oz to 2 or 3oz. It's killing me to just sit and do nothing. I have the humidifier on....and the only reason he is not sleeping at a incline is because his bassinet dose not tilt and also since being sick he sleeps with us. This cough is bothering him when he sleep and he is really drained and tired I can tell. Idk what to do....i just feel doctor's should do more.😡😠