Really.. When it come to depression.. I am a victim of it... To my own observations depression sets in when i get frustrated, less busy or broke.. Sometimes it makes me feel empty or been stagnant...
Funny how it affects human lives and activities.. I even get depressed whenever i feel am not achieving anything but i see others do...

To save yourself from depression... Find something to keep you busy, map out your daily routine and make different routine every day, register all you achieve each day and make everyday count..
Have a year resolution and work towards them.. Lastly, believe in yourself and always be happy