You ain't alone, my friend. Depression is a hell I used to (and to a degree still do) deal with on a daily basis. But don't give up any. Look, I know anyone dealing with depression has heard that a million times and you'll hear it a million more, but believe me when I tell you it's true. Life is tough, heavy, and sometimes seemingly hopeless. But it's never impossible. Things happen and when they do, whether it's your body causing it or an external cause, it will drag you down.
I always found the best thing to do is to get up. Take a walk. No goals, no plan, just walking. Walk through nature and enjoy God's earth. In the words of Rodney Atkins, "If you're going through hell, keep on going" because you will get out. Just like how the sun comes up after a long night, no matter how long it takes, it will come up. You will see that sun and you will feel that good warmth again.
"Do your duty in all things. You cannot do more, you should never wish to do less."
~Robert E. Lee