I Have A Very Dry Unproductive Horrible Cough, It Seams

I have a very dry unproductive horrible cough, it seams that only warm vapors or a warm towel to my mouth helps some, seen dr last week, she said it is a virus, let it take its course, got codeine tabl .15mg, taking herbal expectorant OLBAS COUGH SYRUP
My eyeballs are blood shot from coughing, it gets very hard every evening as the dry cough intensifies
Can you suggest anything?? thank you, Olivia