The lung does much more than just breathing when looking at this organ system from a Chinese Medicine perspective. It helps with the circulation of body fluids, immune regulation (Wei Qi), maintains body temperature, and is useful for mental and emotional difficulties as it helps to lift the mood. The lung is associated with metal, and lung type people often thrive in order and structure as you would see in a large metal building.
The lung connects the heart and the liver; it is in charge of the flux coming in and out - like your breath going in and out of your lungs. It can also keep other organs in check, and it is understood that all bodily qi has its origin in the lung.
Have you found any of these symptoms before? How did you work to improve them?