It sounds like your son's asthma is not in control. He probably needs to see a pediatric pulmonologist or a pediatric allergist to get control of the current problem and establish a way to keep him there. There could be a continuation of the chronic sinus problem, despite the surgery. This is not so uncommon. I would speak to your son
My son had also a severe asthma and was always sick; until his doctors gave him SINGULAIR 10MG and believe me that works as a charm. My son is now 19 and seems he has gotten over it but still his doctor makes sure my son gets his flu shot every year. My friend's child was also going through the same thing. She kept taking her 9 year old boy to the doctor but nothing helped. He was missing a lot of school. I suggested she should ask the doctor to prescibe him SINGULAIR 10MG and she did now he