On why the question: What diagnosis do I have? Really doesn't matter...

Diagnosis-----------Kappa

Bipolar-------------.84
Major Depression----.64
Schizophrenia-------.65
Alchohol Abuse------.75
Anorexia Nervosa----.75
Bulimia Nervosa-----.86
Panic Disorder------.58
Social Phobia-------.47

Source: Williams et al., 1992.
[So that might be DSM-III?]
Note: The numbers here are a statistic called kappa, which measures the proportion of agreement over and above what would be expected by chance. Generally, kappas over .70 are considered good.

That is testing inter-rater reliability, by the way. That is how much clinician's agree with one another as to what dx a person has.