How Can A Continuous Cough Be Treated?

I have had this cough since january. It won't go away!! it goes and comes back. Drinking warm foods keeps it at bay but do i seriously have to carry a mug of hot water mixed with ginger around all day everyday? I stopped working out to give my body a rest. I got an x-ray and nothing showed up. I was given antibiotics because the I got a bacterial infection which is unrelated to my cough. My promary care physician gave me xopenex thinking it was workout induced asthma. It is not. It has been six months and I have lost around 10 pounds of muscle mass. I am studying for my MCAT which is in 3 weeks and I am always coughing while I study. It is very annoying and no one knows what is wrong.