Anhedonia can be a characteristic of mental disorders including mood disorders, schizoaffective disorder, schizoid personality disorder and schizophrenia. For example, people affected with schizophrenia often describe themselves as feeling emotionally empty. Mood disturbances are commonly observed in many psychiatric disorders. Source: http://en.wikipedia.org/wiki/Anhedonia
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I don't have this but I know several people that do. The movie "Silver Linings Playbook" was a very realistic portrayal of what it's like for someone to live with this disorder and how it effects the people that love and live with them. If you have a loved one with Bipolar, I highly recommend seeing it just so you know that you're not alone in what you are experiencing.