Please see a doctor or licensed mental health professional.
According to the DSM 5, these are the diagnostic symptoms for depression:
Depressed mood or a loss of interest or pleasure in daily activities for more than two weeks.
1. Depressed mood or irritable most of the day, nearly every day, as indicated by either subjective report
(e.g., feels sad or empty) or observation made by others (e.g., appears tearful).
2. Decreased interest or pleasure in most activities, most of each day
3. Significant weight change (5%) or change in appetite
4. Change in sleep: Insomnia or hypersomnia
5. Change in activity: Psychomotor agitation or retardation
6. Fatigue or loss of energy
7. Guilt/worthlessness: Feelings of worthlessness or excessive or inappropriate guilt
8. Concentration: diminished ability to think or concentrate, or more indecisiveness
9. Suicidality: Thoughts of death or suicide, or has suicide plan
MA, your advice is good for someone who feels a bit down one day. Not someone who is depressed.