I have finished active treatment (chemotherapy, surgery, radiotherapy) and am currently taking tamoxifen. I was first on zoladex and letrozole and have been on tamoxifen only since July 2023. My periods stopped September 2022 when I started chemotherapy and last month they started again for the first time. I have been experiencing ovulation type pain but more painful and lasts for days, and have also been having breast and nipple tenderness on my remaining breast. Also had terrible PMT symptoms and insomnia before the period. I was wondering if anyone else has experienced this on tamoxifen and if it is normal? I feel a bit concerned about the breast tenderness particularly considering tamoxifen is supposed to prevent estrogen from having an effect on breast tissue.
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