I was depressed for quite some time. It was causing problems at home and at work. My wife insisted that I talk to our GP. He tried a couple of things. Prozac seemed to work; I felt great but my wife thought I was just as hard to live with as when I was depressed. I went back to the doc with this and he referred me to a psychiatrist. The psychiatrist gave me the tests and interviewed my wife. He made the preliminary dx and prescribed meds. Based on my response to them he made the dx.