If you're having that kind of day, I'm here to help you put it into words. Here are a few of my faves...
"I'm having a double-espresso kind of day, but my brew is set on herbal tea."
"A few of the stars in my constellation went dim; somehow I went from the Big Dipper to just Dip."
"Some days I'm Tigger, some days I'm Eeyore, but most of the time I just feel like Pooh."