Croup?!

I’m a first time mom and my son is 3 months old. He came into contact with his fathers family (unknown to us they got sick) and my 5 month old niece lives with them (she got croup during this time) Fast forward almost 2 weeks, im starting to get a mucky (mucus) throat feeling and sore throat. My little boy sounds congested so he’s getting some meds right now (zurbees?!) I don’t know how to spell it. I’m taking massive amounts of vitamin C. (I formula feed) besides the humitifer, saline drops (for if he gets stuffy) and the meds and the chest rub is there anything else I can do to help my baby? He’s sleeping more and crabby and just not feeling himself (he normally downs 6 Oz easy of his formula just isn’t doing much but 4-5. )

Ps. He hasn’t ran a fever yet and only a few coughs. I need adviceB