Has anything changed in your life from the good flying dreams to the bad one? Changes in dream patterns usually have equivalent change in the dreamer's everyday reality. In this dream was it the flying that was unpleasant, or what you saw? The problems on the ground could be anything from the current economic situation to something in your personal life that you find disturbing from a distance. Sometimes it's hard to figure out what actually has meaning and what was just put in your dream to fill in blanks in the story.