Hi Christine,
Seeing 'visions' and hearing voices, is something that has happened to me from a very early age. For example, I can remember walking home from primary school at the age of five and hearing my first name as if the speaker were shouting in my ear. This happened often as a child, and less often as an adult, until now, I hear it very infrequently indeed. I have managed during this and many other 'strange' episodes, to hold down a steady career, get married etc. As with dreams, waking visions and sounds can, I feel call upon us to listen with the deepest intuition. Whenever my name was spoken for example, there would be a reason that became apparent.
So, I agree with Tony that healing voices and seeing visions most certainly and often is not a sign of being mentally ill.
Steve