Chronic bronchitis may or may not be reversible. In the 60 year old person who has smoked for 40 years, it usually is not. In a young person who smoked for 5 years, the chances are good that it is reversible. Until it clears, you will continue to have excessive phlegm. Some of this could be in the small airways and thus not reflected in the results of simple breathing tests called spirometry.
Good that you are going to see the respirologist again and getting a chest x-ray.
Chronic bronchitis is a persistant cough for three or more months for at least 2 years. It is not reversible, but depending upon environment or seasons it will "flare up" or become worse. ie- some people don't have symptoms in the summer but have horrible ones in the winter.