question: my 4 yr old son is having respiratory allergy since two years , he is taking budecort rotacaps and mometasone nasal spray.. last night he suddenly developed cough with barking sound and difficulty in breathing . doctors gave some nebuliser treatment.. his stridor is gone now but cough is there. i whould like to know the cause for the problem and how to avoid it happening.. and at what age he can overcome all these problems..