Need advice and encouragement?

Okay so my little brother , 2 and a half years old , had a bronchitis while we were in Romania. Then he got a vaccine , he was treated and got better. It was in May. But last night at 1 am he was coughing weirdly. He had trouble breathing. So we called the police and the ambulance. They came fast. My brother was given oxygen and he was treated by a doctor , my parents stayed at the hospital from like 2 am to 9 am. Then now , he is sleeping but he still wheezes (dunno if that is the term) a bit when he coughs , there's an improvement though. He'll be okay right ? Please help. I'm scared , I'm only 12.