Sad? Moody? Depression?

I don't know why or how, but currently i am not feeling happy from inside out. Why? Not sure at all, just don't feel happy now. Perhaps due to my work life which is kind of bothering at times? Hmm... am i complaining or what? I am confused now actually, but perhaps i need time to think and get things straight for my life. Drastic change for drastic measures? Let me think...