Are you doing what you love? Not for your job, although that would be nice, but for your sanity. When it all gets a bit too much, this is one thing I always like to check up on. Often the reason for feeling down is a lack of doing what you love to be doing, which means you need to get out there and do it! Doing what you love is something that is worth making up an excuse for, it's for your sanity after all!