Uncontrollable Emotions

One minute it's an outburst of anger. The next you're crying uncontrollably. Nothing outside of you prompted the change, but your emotions are up and down in a moment's notice. Depression can swing your moods around, keeping you away from the calm you so desperately want. Similar to another mood disorder — bipolar disorder — moods can fluctuate uncontrollably, which is one reason why the two are often confused. for more       http://www.healthline.com/health-slideshow/recognizing-depression-symptoms?utm_medium=yahhp#7

Appetite & Weight

Weight and appetite can fluctuate differently for each person with major depression. Some will have an increased appetite and gain weight while others won't be hungry and lose weight. A distinguishing factor to determine if the dietary changes are related to depression is whether they are intentional or not. If they're not, it's a clue that something larger is wrong.

Anxiety & Irritability

Sure, Picasso's "Old Guitarist" might have summed up the depressed painter's emotions during his blue period, but often people with major depression see plenty of red. The physical and mental toll of depression also contributes to anxiety and irritability. Research shows men are more likely to show these signs because the sexes react differently to depression. Women are more likely to internalize their problems while men tend to externalize their feelings by blaming them on other people.
http://www.healthline.com/health-slideshow/recognizing-depression-symptoms?utm_medium=yahhp#5

Fatigue & Sleep

Part of the reason you might stop doing things you enjoy is because you feel so tired. Depression often comes with a lack of energy and an overwhelming feeling of lethargy, which can be the most debilitating symptoms of depression. This could lead to excessive sleeping or no sleep at all.
Depression is also linked to insomnia, as one might lead to the other and vice versa. They can also make each other worse. The lack of quality, restful sleep can also lead to anxiety, which is explained on the next page.   for more http://www.healthline.com/health-slideshow/recognizing-depression-symptoms?utm_medium=yahhp#4

Being unhappy isn't the same as being depressed. Depression is a term often used loosely to describe how we feel after a bad week at work or when we get dumped. But major depressive disorder – a type of depression – is much more complicated. The specific symptoms and signs determine whether it's depression or just a case of the Mondays.
Determining if persistent, unshakable feelings are a result of depression can start the process of eradicating them from your life. Click through this slideshow, and test yourself to see if it's time to see a professional.

Changed Feelings

Major depression is a mood disorder that affects the way you feel about life in general. Having a hopeless or helpless outlook on your life is the most commonly associated symptom of depression. Other feelings may be worthlessness, self-hate or inappropriate guilt. Common, reoccurring thoughts of depression are vocalized as, "It's all my fault," or "What's the point?"

Depression can take the pleasure or enjoyment out of things you love. A loss of interest or withdrawal from activities that you once looked forward to — sports, hobbies, or going out with friends — is yet another telltale sign of major depression. Another symptom of major depression is a decreased sex drive and even impotence.