I had DCIS then IDC in the opposite breast. The first time I had lumpectomy, radiation and tamoxifen. The second time...11 years later, I had lumpectomy, radiation and am taking anastrozole. The first time was stage 0, the second time was stage 1 invasive ductal cancer. We are talking apples and oranges here. Did you get tested for genetic mutations that might be involved? After the second time, that was offered to me and I do have a mutation...CHEK2...not the brca1 and 2 that are common. If I had been tested after the first occurrence, I would have had a bilateral mastectomy then or right after the second occurrence. I am definitely getting the bilateral mastectomy with reconstruction now. The first cancer was 2007 and the second was 2018. It’s a crap shoot and hindsight is a wonderful thing. I had some discomfort on the tamoxifen and am having very little on the anastrozole. I think exercise helps. I walked and continue to walk 3 miles 3-4 days a week...more if the weather and the schedule permit it. Good luck.