my visits from AF have been awful, the worst ever. The first couple of times the pain got so bad it was like being in early labour again. Would take my breath away and leave me doubled over. And yeah, very heavy flow. They are calming down now though thankfully! I figure the way to think about it is that the last time our uteruses (uterusi?? lol) had to make that sort of movement was while giving birth so they are probably going to be a bit full on for a while