Did you read Tina Fey's Bossypants? If not, do it. It is hysterical and I still have my "Growing up and Liking It" pamphlet from lady-parts day in fifth grade, same one she talked about. I digress. In her book, she describes this, and I can sense mine coming on. Mine are probably more frequent, as I don't have a Tina Fey-esque cool job, but it's the same sort of thing.
I can tell it is coming because this song came on just now, and I was literally doubled-over at my desk, sobbing. When I was pregnant, I was sick all the time, the whole time, and crying ALL the time. This song put me over the edge and obviously I listened to it nonstop. Note: I am aware that this is Taylor Swift.
So everyone look out. I am seriously losing it. Now everyone let's talk about how this happens to you as well so I don't feel like I have to go back to my therapist.