Mystery solved (I hope)

Poor Alaric had been coughing for nearly a month. Several visit to PD and daily dosage of Salbutamol had not been effective. Sleeping soundly at night seems like an impossible task. He will be awaken by his coughing around 12am-1am.
During our last visit to PD, we expressed our concern and requested for antibiotics which we try not to give unless necessary. We are worried that the constant cough will affect his lungs as he has sensitive nose and lungs. It may even lead to asthma.
With the help of antibiotics(2 weeks dosage) and lots of effort keeping the house clean at all times, keeping all plushies out of sight, also with the help of a air purifier cum humidifier at night, his coughing is lessen tremendously. One more week to complete the antibiotics. I hope his condition remain this way while we also stay hardworking to keep the house clean. Change all bedsheets and mop house at least once a week, wipe of dust in room and vacuum house daily, etc.
I do hope everyone in the house is cooperative enough to make things happen. For the good of Alaric at least.