My heart goes out to you...there are not many things that feel worse than when one has been worn thin. 
Many people, places, and things can make it hard to walk life's road...some make it harder than others. To lose oneself is one of the most difficult of shadows that we pass through in a lifetime. It is even more difficult not to allow the dark to drag us back down again. To find our way through the darkness... we must only focus on the lights that shine the way. Whether they are found in a book or a lover's gaze..they are all around us if we simply look. We must only do what makes our soul shine so that we might light the way for others.  
I hope you find your way back soon.