Fighing winterblues/depression

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A few years back I went through a significant depression where I couldnt stop crying all day everyday, couldnt get out of bed, couldn't eat, couldnt get that horrible feeling of dread to go away for weeks! I have found changing my diet and excercising as much as possible especially during the winter months has done wonders for me. I tried medicine which helped but I feel that most of it is a head game and you really are fighting your own worst enemy. Somedays I do feel that dreadfullness trying to creep back in though. Can anyone relate?