As a Christian who has struggles, it is not a sin to seek professional help. Telling someone helps you makes sense of the voices in your head. Yes it is scary. Yes you will be vulnerable. But until you begin to unburden the secrets of your heart and deal with it, even your happiest moments will touched by darkness.
So I encourage you today, tell someone. There is no shame in struggling. The is no shame in admitting you needing help. There is no shame in mental illness.