From a strictly clinical view, are those who have spiritual gifts actually suffering from mental illnesses?

[Shelley C]

I have had "visions" of the future all my life. They have come true 99% of the time. This scared my father so badly that he sent me to psychiatrists and I was diagnosed as severely depressed. Even on meds I still have the visions and still have the abiltiy to see events. So I am not convinced that the mental illness brings on the visions or the visions bring on the illness. The female side of my family is gifted in this way for many generations. Having been put in a position of being outcast for such gifts is a big part of the depression as well as the mental illness passed down by my father. So I do not believe that one is a result of the other but can be closely associated due to pressure because of family and peers.