In the world of dreams the rules of reality do not necessarily apply. Each dream is unique and it's a direct link to the soul and spirit. Psychology provides its own theories on what dreams mean, but so did tradition and the study of dreams for thousands of years before any relevant science had developed.
Dream Meanings - Doctor
If you see a doctor coming to your house when you are not actually ill then expect troubles. If, however, you see that you are a doctor then you will have an unexpected joy because some money will unexpectedly come into your life.