I read this earlier- which was timely, as I have been in a bIt of a shitty mood the last couple of days, and today my period arrived. I much preferred this article than one I read a couple of weeks ago which said any symptoms (psychological or physiological) are in our heads. I realised at the end that it had been written by a man 
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I am pretty sure my clumsiness, irritability and then pain are not "in my head". That said, we are done with kids so I'm no longer tracking which means I just wonder why I'm so ducking miserable... until...