Tamoxifen?

Hi Linda: Just got back from my Onc. He is going to run a FSH test (I think those were the letters) to see if I am pre or post menopausal. I had just started to skip some periods when I was diagnosed with BC at age 49 (2 years ago). The chemo threw me into menopause and I haven't resumed any periods since treatment stopped. I have been getting little "twinges" from my ovaries like they are trying to release an egg. I have been on Tamoxifen for about a year and a half. I have just come upon some research recently that indicates in certain circumstances with HER2 involvement Tamoxifen shouldn't be taken. My Onc is going to do some research about this for me...says he has a friend that is studying HER2 and ER+ breast cancer....and get back to me. So we will see.
Thanks for your response. Take Care, Linda