I'm a 45 yr old female and have been premenopausal for several years.My periods are for the most part regular other then very bad cramps that start around a week before it's due..I was due on Oct 21 and started cramping a week before..Well not only did I not get my period but I'm still having pretty bad craming..Is is possible I've finally hit full menopause and if so is this ongoing cramping with no period normal?