I have a Mirena IUD and have had it for 4 years now. my periods gradually got lighter until i have none. for the last year or so every time i am around a friend or family member or just around a lot of women i have a period out of nowhere! it lasts about an hour or so or untill i am no longer whoever has their period. it is so strange and i dont' know what is going on! i have always heard that when there are a couple of women living together they tend to start and stop about the same time and this was the case when i lived with my mother and sister. everyone thinks i am crazy and that what i am saying is impossible but it happens over and over! please help me and tell me i am not going crazy!!!!!