There's nothing worse than that rain cloud of doom hanging over you and you don't even know why it's there. If you can muster up the energy or a single ounce of G.A.F then try doing something you usually enjoy.
For me it's putting my music on and cleaning - I don't like cleaning but I like the focus and the music and the thinking time. Everyone has different things to help them cope that's just one of mine.
I'd suggest like the other guys said if your medication isn't helping then make an appointment. Depressions crap and physically and mentally we have to force and fight with ourselves for the good of ourselves