How do you know if you are clinically depressed?

The DSM-IV diagnosis of a major depressive episode requires that a person exhibit at least five of the following symptoms nearly everyday for at least two weeks. Either depressed mood or loss of interest and pleasure must be one of the five symptoms.

1) sad, depressed mood
2) loss of interest and pleasure in usual activities
3) Difficulties in sleeping (insomnia); not falling asleep initially, not returning to sleep after awakening in the middle of the night, and early morning awakenings, or, in some patients, a desire to sleep a great deal of the time
4) shift in activity level, becoming either lethargic (psychomotor retardation) or agitated
5) Poor appetite and weight loss, or increased appetite or weight gain
6) loss of energy, great fatigue
7) Negative self-concept, self reproach and self blame; feelings of worthlessness and guilt
8) Complaints or evidence of difficulty in concentrating, such as slowed thinking and indecisiveness
9) recurrent thoughts of death or suicide

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If it only requires one to have five symptoms over 2 weeks every day to classify as a depressive,
what do you call one that is off the chart with all the symptoms for 3 weeks every day and then some?

I wish i am not a psychologist at this moment.