It is a lot harder for people of very high intelligence to ignore unpleasant realities.  I recently read about a study that showed a relationship between high IQ and anxiety, and previous studies have shown a link between high IQ and depression.  People with depression score higher on tests of realism, too.  So it would seem that being happy and relaxed may depend to some degree on being able to ignore certain aspects of reality, something that the gifted just aren’t good at.  I bring it up because I think in the case of the highly intelligent, anxiety and depression may not always be pathologies, but simply the result of our more perceptive minds.  Of course, there is a point where anxiety and depression do become real problems, and then they should be treated,