Can my mental illness hinder my ability to be saved by Jesus?

For instance I hear voices, sometimes they are threatening. I am told this is the symptom of early onset schizophrenia. The trouble is when I pray how do I tell the difference between these voices answering and that of Jesus? I am confused by which one I should obey and perhaps a voice will tell me to do something for instance that is criminal. Will Jesus' love cure me or am I condemned to hear these voices for the rest of my life?