I have been coughing (usually wet, clear/white phlegm) once a day, and sometimes twice, every day for 10 weeks since I had bronchitis. I am also experiencing phlegm in the back of my throat constantly, I have been to the doctor and they gave me am inhaler but after a second opinion they do not think I have asthma. I have some pain in my chest that is on and off, but this seems gas related,and I have been getting much more regular heartburn than usual. I am beginning to get worried about my symptoms that they might be something serious (esp the big c, as the result of health anxiety), but I am only 18 years old and my doctors don't seem bothered. Should I be worried?