I've decided I'm going to compile a folder (on my phone probably) of things that make me smile. Jokes, cute pictures, nice things people have said to me. And whenever I end up with days like today, I can just take a minute to open it up and look around at stuff in it.
I used to have a physical box I kept stuff like that in, but I don't think I could bring it to work.
I recommend it for people who are easily agitated or having a rough day, so you can just take a moment and regain your bearings.