I've battled depression and anxiety for as long as I can remember. I have it a bit more under control these days but I still have moments when it all just goes to hell again for a few days at a time.
You are so not alone with this condition. It is a matter of learning to deal with it and try not to give in to it to a point where you won't go out. I've had dark days and gone out. Then I've met somebody and gone for a coffee with them. It lifted my spirits.