My baby had RSV at the beginning of november, he was hospitalized for 3 days 2 nights. he was 6 weeks old. But since then, he has a phlegm sound and boogers, he has trouble breathing speacially during the night and when he wakes up. He uses humedifier all the time, and I am just sad that he doesnt get any better today his pediatrician told me he is negative for RSV, what else can I do to help him get better?