Hi my 4 year old nephew has had a persistant cough now for a few months, my sister took him to a doctor who said its a habit he has formed when concentrating on certain things, and that he will grow out of it. Now I have noticed he keeps blinking and rubbing his eyes, morning noon or night, he has dark circles under his eyes and is still coughing also, sometimes a deep cough where he has to cover his mouth and concentrate on clearing his throat. Im worried about it being something more. Is there something I can suggest?