why?

Why am i so depressed?Is it me?Is it pregnancy hormones?Am I just not happy?Is this payback for something I have done in my past?I cant deal with it anymore.I am to the point of a melt-down.believe me I know.I lost it this morning.Too much is going on and I feel like nobody understands me and I have nowhere to turn.I just want to run away..Is that wrong?I work hard all day and then I go home and work some more.I do what I'm supposed to do.Why cant people appreciate that?