5 month old has wheezes and cough.

My five month old son has bronchiolitis, makes slight wheezy sounds. He has been coughing since last two weeks. We have been giving nebulisation earlier with levolin and butecort and now wity budecort only as advised by doc. He had this issue two months ago too but without wheeze. This time it seems more prolonged despite him being on nebulisation for so long. How safe is nebulisation for such a long period and also the cough seems the same to me since past 3,4 days. He coughs in night which seems like something collecting in throat and doesn't seem to be improving. Also m concerned if this can cause greater concerns. Doc says its prolonged due to weather change. Pls advise have started ascoril drops today.