Riding the wave of depression

Every once in a while I get really down on my life.  Everything seems hopeless and all I want is to escape.  But there is no escape, not without serious life-altering consequences.  And franckly it's not just about me anymore.  Plus, no matter what you think you are escaping from, it's still always with you.  Because really my problems will always be in my head.  It's nobody else's fault but my own. 
Thankfully I know that when I feel like I'm on the brink of fleeing, it's just temporary -- I'm at the lowest low of my emotional wave.  Tomorrow is always brighter.  And indeed as I type this today, I can say that it has passed.  I got my little escape from reality last night and I am grateful for it.  Of course my mood has a profound effect on my loved ones who can't understand why Mommy never smiles or why she's so cold to Papa.  This I have to work at.