This is not the type thing that I or (in my opinion)most pixies should try to help you with .If its something that troubles you regularly then find professional counseling.
If its just something that has really no affect on how you relate to your friends and family,then just let it go as a bad dream, and find the things that bring happiness into your life.

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Happiness is not a destination, but a journey, the bumps and chuckholes are just part of the trip!