Recently a friend of mine had a heart attack.  It's got me to thinking the last few days about my life...About where I am and what I'm doing.  The choices I've made and the many more I will make.  I go through periods of restlessness, being uncertain, and general displeasure.  I know I'm not alone.  Many of my friends are feeling it too.  It leaves me wondering though, what am I doing and what is the source of these feelings?  Is there something I can be doing to improve my state?  I have quite a lot to be thankful for, yet sometimes I feel like something is missing.  I know that this is coming from within me however.  It's not something that can be eleviated by an outside source.  I want to find what it is and become at peace with myself, my life, and my surroundings.  I'm just not sure how to do it...