sick baby..

My son is only 2.5 months and has kept a cold on and off for bout 3 weeks now. We have been to several dr apts (another one in the morning we will go to) as well as the ER when he was running a fever once during his cold. I understand they don't want to give babies antibiotics bc they don't weaken their immune system and want their bodies to fight it off. I've constantly kept Vicks baby rub on his feet with socks over & on his chest, bought a humidifier, use saline drops and a battery operated nasal aspirator...I also run a hot shower and close the bathroom door to let it steam up and we sit in there for a few mins. He is just absolutely miserable tonight tho and I have no idea what else I can do!!!!???? I really wish they would put him on an antibiotic!!! The last 2.5-3 weeks have been ROUGH! ☹️😔😔😔☹️☹️🤔🤔 we need rest!!! He can't sleep well due to being congested and difficulty breathing which makes him 10times more fussy.... I just don't know!!!!!! Ughhhh!!!!