I Know Why

I finally found the reason why I'm so depressed since the starting of 2010.. I think I'm lack of challenge in my job.. My work load is heavy as I can reply to 200 - 300 emails daily but it is the quantity but quality.. I feel that there is not much for me to learn in my current scope of work.. I need new level of challenge.. My colleague has says that one should be equip with the ability to learn, unlearn and relearn.. so maybe I should do that :)