5 year old with cough variant asthma

my son is 5 and was diagnosed about five months ago. We had it under control then didnt and now he is on advair twice a day and albuterol for breakthrus...he had went a whole week without using the albuterol once. Now he got a cold and coughs and coughs and coughs especially at night time. I dont know if I should call the dr and go in again..he did say if he got a cold it would be worse. But how often can I give albuterol he had said if its bad at nigth give two doses an hour apart but then what.......can I give over the counter cold meds too. I am so tired and lost and tired of coughing I know my poor boy cant help it but I feel so helpless and dont know what to do. Its cold season and I dont want him coughing for the next four months his school will suffer and all of us . Any help is greatly appreciated

 

Thanks

^{~Left sided Uc -'92 - Colazal (9 daily), 6mp (50-100mgs), Prilosec, Biotin, Forvia, Pro-Bio, Colocort**Unable to tolerate Asacol, Rowasa or Canasa**}