Wheezing continued after nebulization co

My son has wheezing n coughing after nebulization once a day of 4days continue. I am worried about his health.we are living in Bangalore,climate z very cold. Initially it's very severe heart beat n wheezing from heart ,caugh, high fever and baby z Soo dull,refused to eat .After doctor suggestion, nebulization to 4days with syrup,asthalin & relent+,azithrol. Now after 4 days,fever reduced,baby become active,willing to eat ,wheezing also reduced, normal heartbeat but wheezing sound is coming, especially at night it's high and mild caugh.last year it came and reduced in 3days, This time not yet reduced. How long z safe to use nebulization? How many days it will take to get reduce complete wheezing. Medicine changes needed? Kindly suggest me.