Hi I was on tamoxifen for about 6-8 months. I had hot flushes and found I was very anxious. At the time wasn't sure if it was tamoxifen or getting over active treatment ( chemo, mastectomy and reconstruction) Last visit with oncologist we discussed Aeimidex, so I had blood test and I'm post menopausal so I started on Arimidex. I still have hot flushes and joint pain but in myself I feel better. Our bodies react so different what is right for one is not always right for others.
When taking tamoxifen I was taking it at breakfast but then changed to taking at night. Good luck I hope this helps