Tired of being tired!

I've had some cravings lately, but the worst part of it is that I am tired.....ALL the time.  I have dieted and exercised before but have felt energized in the past.  This time I am tired.  I also feel hungry all the time.  Usually an hour or so before lunch I feel like I'm starving.  I am taking it easy today and will get to bed early.  Tomorrow is a new day.