Hello lovely moms, can you tell me what to do with my son who is 2.7 y…

Hello lovely moms, can you tell me what to do with my son who is 2.7 years old? He has a cough after RSV, specifically at night after falling asleep, about 3-4 hours later he starts coughing and so on in the morning until it's full-blown and with vomiting reflex, this has been going on for 3 weeks, there are no phlegm, breathing is free, the cough is moist, sometimes dry. We have been using a nebulizer with Lordex medication, and we have taken Suprastin for 5 days according to the doctor's prescription. But the attacks continue as they were. Can you please tell me if anyone had such a thing? My child is suffering