I am age 43 with no menstrual cycle since 12/27/2013. I had a recent pap smear.I am not on any birth control, tested negative for pregancy. I have no cramping or pain. I do have occasional hot flashes and insomnia. I exercise very heavily 5-6 days per week, low body fat, low weight, and have a low fat diet. I worked in a stressful environment. Unsure what is causing amenorrhea and wondering if I am going into menopause?Or is my body in perimenopause?Will the menstrual cycle return?