Shooshoo said:true, but there is a difference between sadness and depression, don't you think?
I see depression more that you don't want to go on. A feeling of heaviness.
I see sadness more a result of disappointment. This I believe is healthy to express cause it's part of your emotions.
I have had some depression periods in my life as well. Life gets to you sometimes; especially living alone (no family around) in a foreign country.
From what i researched and were told, the difference between sadness and depression is 2 weeks. If after 2 weeks you are still sad, then you might want to look into depression symptions and see if that fits. If you are truly ok again in less than 2 weeks, then you have just been sad. I guess it is one way of measuring........
My mom read a wonderful book about diet and depression; something like ' be naturally depression free '. The book claims you can do wonders with just eating correctly, as has already been mentioned by another poster.