Have I got lung cancer?

Now,since this is my 3rd question about cancer on Y!A,I think I'm a little bit paranoiac.However,since 1 month,I'm coughing everyday,and it never stops.We went to a doctor and I had X-Ray,however,they told me that I'm just bronchitis.I'm using antibiotic since 13 day and there are only 2 pills remain.However,my coughing still continues.I also have a pain in my chest sometimes and I cough sputum.Now what the hell is happening to me?