sorry, but there is no way you will ever convince me it was anything but the tubal ligation. i never missed a period in my life and they were all normal. i had a tubal ligation and in one month is was in post menopause. not even reg menopause. the dr said it was a woman in her 60s. i was 39. sorry, but PTLS is real. one theory is that the messenger cells can be killed during it and you no longer get messages through from the brain to release the eggs.