My child has been having a persistent cough for the last 4 years. Sometimes it comes continuously and sometimes it doesn't. When the child turned 3 years old, it was discovered that the child had tonsils, so I started homeopathic treatment for him.He continued it for about 2 years and it made a difference, but then he started coughing. After consulting many doctors, we got him operated on.Recently or a month ago, I didn't have a cough for a few days but then it started again. Please tell me what to do for this.