I've been on hrt for approx 10 yrs, my dr would like me to stop. On estrace 0.5mg should take daily, however, only taken 3 pill weekly, also taking prometrium 100 mg for 12 days/monthly. I have numerous hot flashes, and wondering why I should stop taking hrt when in fact they are not synthetic. I am very healthy 65 yrs old and feel and look 15 yrs less. My mom lived until 101 yrs old.