Hello! We've been sick for 2.5 months. Six days ago, dry cough started…

Hello! We've been sick for 2.5 months. Six days ago, dry cough started, the first two days were dry cough, I thought it was because of dry air at home, it's very hot in our house, we have a humidifier constantly working. He was restless, although he is usually calm. On the third day, the cough began with phlegm, the pace was not bad, became calm, even slept all afternoon. On the fourth day, I called the doctor to see him. He said to give him an expectorant for coughing. I didn't give it to him. And he said to do drainage massage. I am doing it, phlegm comes out well. Yesterday and