My periods resumed about 2 years into Tamoxifen. I was 45 at the time and they continued on exactly the same schedule as they did all my life until I had my ovaries removed at 53. The unwelcome activity in your brain box isn't unusual either. You are doing the right thing getting the scans and follow up the spotting business with your onc. We don't need the stress of endless appointments, but we cant afford to ignore anything either. Things generally go shit shaped for me in December, just to guarantee maximum difficulty in accessing services. HanG in thereMXX