Like I said, no one should be going to the doctor for a common cold, except in exceptional circuмstances such as the immunocompromised, those on chemotherapy, for example, where what is usually an insignificant malady could be life threatening, and such patients should certainly not expect their eye specialist to deal with it! Similarly, those who develop more worrying symptoms like your ED case. But as Giovanni said, he was only using the cold to make a point. No snarking or platitudes intended.