hi, My son is 3, and he has, what sounds like wet couch in combination with dry cough when he feels hot. I mean after running, or when he is in hot room. It never went away after he had a virus (about 6-7 months ago ), during that virus his fever went as high as 104F degrees, about He also has the following symptoms: dry, stuffy nose(his nose is not running but when he inhales or exhales through his nose i can hear that it s clogged) and very dry chapped lips. My question is what could it be and what causes it, and what could happen if left untreated, and what can I do to treat it.