Someone tell me the exact symptoms of depression?!

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I think you are clinically depressed, or at least on the verge of it. That sounds a lot like how I feel right before a depressive episode. Talk to your parents about how you feel, and ask to see a therapist or psychiatrist(if you feel it's bad enough to need anti-depressants). I know you may feel like it will never end, but I PROMISE YOU that it will. It always ends eventually. You'll be okay.

To answer your real question, here is what I found as for symptoms on webmd:
* difficulty concentrating, remembering details, and making decisions
* fatigue and decreased energy
* feelings of guilt, worthlessness, and/or helplessness
* feelings of hopelessness and/or pessimism
* insomnia, early-morning wakefulness, or excessive sleeping
* irritability, restlessness
* loss of interest in activities or hobbies once pleasurable, including sex
* overeating or appetite loss
* persistent aches or pains, headaches, cramps, or digestive problems that do not ease even with treatment
* persistent sad, anxious, or "empty" feelings
* thoughts of suicide, suicide attempts

personal experience (I have Bipolar) and http://www.webmd.com/depression/guide/detecting-depression