How to proceed in a child with a dry cough?

Inhalations from Nebbud and worse cough after it 😏 Hello warmly còrka 4 year old auscultatively is clean and the throat is also wporzadku but still coughs. Yesterday, after the visit, the Pediatrician ordered us to inhale 2 x a day 2ml of Nebbud. I made her first inhalation before bed 2 hours and gave levopront antitussive syrup for the night. in the morning he coughed terribly 😔is it possible that something could have developed or is this a normal symptom? I would like to add that we are in the process of allergy tests because there is such a suspicion and from the allergist I got an order that during the infection we should administer 3x17 drops of Berodual and Nebbud 2xdziennue 2 ml. I don't know what to do :( I ask for a 😊 Council