On October 18, 2007 I started taking Symbicort. It worked GREAT!! As far as breathing better. About a week later I noticed upper back pain, dizziness, and nausea. I continued to take this inhaler. Then on November 5, 2007 I was rushed to the emergency room with a collapsed lung. (Spontaneous Pneumothorax) Still even after surgery I continued to use this inhaler until June 2008. When I finally thought may be it was this inhaler. I don't know to this day. I still feel strange from time to time. At the time of surgery I was only 35 years old.