A girl invited me to dinner and I coughed a few times. I said that I had not recovered from this cold for several months, and she immediately said, "Ah, did you take medicine?"

Yes, this is a girl's heartfelt concern for you. You should cherish her interest in you. But then again, according to your own words, you have been coughing for months, so you really should pay attention. Cough itself means that you have an upper respiratory tract infection after a cold, and your long-term cough means that your trachea or lungs are inflamed. You should take cephalosporin or amoxicillin. Once inflammation becomes chronic, it is quite difficult to treat. You can go to the hospital for a detailed examination. Besides, you must cherish this girl. As for the future, it depends on your own feelings.