thanks for query,
it seems that your child is having Allergic bronchitis
It is possible that he might have eosinophilia
most probably due to worm infestation.
Go for blood for Tc,DC,eosinophilic count.
Go for stool test
After reports go for treatment accordingly.
If this is the cause he will be completely alright.
Asthalin and nebulizer
is safe and there is no harm gicen as and when required.
Ok and bye.