0 – Severely depressed, suicidal and/or homicidal, immediate inpatient treatment necessary, inability to function (in daily activities)
1 – Severely depressed, somewhat suicidal and/or homicidal, monitoring necessary, inpatient treatment likely necessary, inability to function
2 – Severely depressed, passing suicidal and/or homicidal thoughts, monitoring recommended, inpatient treatment optional, great difficulty functioning
3 – Moderately depressed, passing suicidal and/or homicidal thoughts, monitoring optional, some difficulty functioning
4 – Mildly depressed, passing suicidal and/or homicidal thoughts, monitoring optional, low difficulty functioning
5 – Emotionally numb, in a state of existence, no suicidal and/or homicidal ideations, no monitoring necessary, some ability to function, borderline mood (potential for change to 4 or 6)
6 – Mildly happy, content, no suicidal and/or homicidal ideations, little functioning problems
7 – Moderately happy, upbeat, no functioning problems
8 – Moderately happy, optimistic, positive, no functioning problems
9 – Extremely happy, optimistic, cheerful, positive, “in a good mood,” “feel great,” no functioning problems
10 – Extremely happy, potentially manic, active, energetic, euphoric, ability to function may vary
*A plus (+) sign, used only for numbers below 5, indicate that there is no suicidal ideation.
depression introspection 
There’s certainly a lot to find out about this subject.
I really like all of the points you made.