Hi there sorry to hear you son has these problems. Have you ever considered salt therapy? I have been using salt therapy for over a year for my asthma and allegies and I barely rely on my inhalers anymore it is fantastic. Salt therapy is perfect for young kids my friends uses it for her one year old. I bought a device called the salin air purifier you can find it at salinsalttherapy.com they do offer a 90 day money back guarentee it could be worth a shot! Either way I hope you son finds relief.