Feelings
Having prolonged depressed mood
Feeling anxious, worried, and having intrusive, upsetting thoughts
Becoming emotional or upset for no particular reason
Don't want to see people or don't feel comfortable to be left alone; see social activities as something unmanageable.
 
Thoughts
Seeing oneself as a burden to others
Seeing no future, loss of hope
Feeling of having no confidence
Feeling that life is unfair
Feeling that life is "passing you by"
Feeling worthless; All you've ever done is making mistakes and that's all that you ever will do.
Feeling life isn't worth living.
 
Behaviours
Feeling shortness of temper, or irritability
Having difficulties in making decisions
Doing less of what you used to enjoy
Feeling as if even the smallest tasks are sometimes unattainable
Spending a lot of time thinking about what is wrong about yourself; may also feel guilty when being criticized by others
Having thoughts of death or becoming suicidal
 
Physical conditions
Having difficulties in concentrating during the day
Suffering from sudden increase or decrease of appetite
Suddenly increasing or decreasing in body weight
Having disrupted sleep, sometimes with nightmares; Persisting insomnia or feel sleepy all the time
Getting up earlier than usual in the mornings or having difficulty getting back to sleep; being exhausted on wakings
Always feeling tired
Suffering from aches and pains which appear to have no physical cause

If the above-mentioned symptoms have persisted for more than two weeks, and that they are remarkably affecting performance at school or work and interpersonal relationships, don't hesitate! Make a call to counselling hotlines, or seek advice from your physician immediately! You may also schedule an appointment with a school counsellor, educational/clinical psychologist, or psychiatrist to discuss your problems.
 
References:

American Psychiatric Association. (2000). Diagnostic and statistical manual of mental disorders - Text revision (4th ed.). Washington, DC: Author.

 
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