I found I was getting more anxious, and fatigued, along with a host of other issues on anastrozole. I have been taking tamoxifen for 3 months and my attitude, anxiety and stamina are so much better. I plan to stay on it for 6 months then try to go back to anastrozole, rotating each every 6 months to get to the finish line, hoping without so much toxicity. I will circle back after month 6 to report.