How do you differentiate between the voice of God in your head and Schizophrenic auditory hallucinations?

Communication from he Lord is spiritual, not auditory or perceived through the other physical senses. Moreover, Galatians 5 is a good chapter regarding the fruits of the Spirit. The Holy Spirit will not guide a person to belittle or harm anyone, to con anyone, etc. Jesus taught that false teachers can be recognized by their fruits.