Iodine really messes with my menstrual cycle. I can only tolerate tiny amounts. However I have found that these symptoms change over time, so if you stick with a small amount of Iodine (maybe just 1 drop per day?), your cycle should normalize after a few months. Mine did. I belive Iodine does a lot of good for our bodies, so I've stuck with it, but yes it can be horrible when your cycle is suddenly thrown off, and you get strange symptoms. Good luck. :)