Interesting as I was reading an article posted ina medical journal today that stated depression causes fatigue.

In my own experieces, I have found that fatigue caused depression. On those rare days when I have the energy to get through the day without feeling weighed down by the inexplicable fatigue, I find less cause for depression; whereas on those days that fatigue is bogging my body down and rendering me incapable of enjoying life I find myself depressed beyond the normal limits.