Why?

I haven't stopped crying since this afternoon at work. Yep. I cried. At work. It started last night. It hit me and I started crying. I was crying so hard I shut down my computer and went straight to bed. This morning I felt a cloud of sadness hanging over me. This afternoon I got a nasty email from a developer that made me cry alone in my cubicle. Since then I've been bursting into tears.