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Hello, I'm Dr Manos MD, board certified obgyn. I need more information. Your age and how long you've been on Tamoxifen
Your ultrasound results are ok. Endometrium 6mm is reduced from average thickness. The pain is hard to pinpoint including the groin area. For now, you should have something for the pain. Estrogen has so many effects and tamoxifen either blocks estrogen or mimics depending on the site. Could you be building some lactose intolerance that happens with menopause? You might reduce your dairy intake. Are your stools softer which is seen with lactose intolerance.
You should tell your doctor about that history.
I hope I responded to your inquiry and that the symptoms are short lived.