Needin' a Tear Jerking Trigger

Ever get so tired physically and emotionally, and so generally overwhelmed that you constantly feel like you're on the verge of tears, but you can't name exactly what's wrong, if anything at all really?  I just feel like I'm going to burst into tears at any moment.  If the right trigger presented itself, I'd be a puddle of tears. It might be hormonal, or maybe not, but that's how I've been feeling for the last 24 hours. 

I think I need a good cry.