I've heard that people get headaches on their periods do to estrogen levels dropping, but lately I've had severe headaches, nausea and almost constant vomiting the day after my period ends. I've never had a problem until I started wearing my Diva Cup a few months ago. Could it be my cup, or is it just a coincidence?...I don't know how my cup would do that to me though...I actually have to stay home from school on these days now because it happens everytime! Thanks in advance! Hopefully I can get it sprted out because as you can imagine, its not fun!