My history is much less complex than yours. Following a diagnosis of DCIS, I had a lumpectomy 2 years ago, with a lymph node analysis which was determined to be clear. My cancer was small, less than 2 cm and estrogen-positive so I was prescribed anastrozole. I took it for 6 months but the side effects became so severe that my oncologist told me to quit. He did not recommend any other similar med, because he said I'd have the same kinds of side effects. My last side effect was so severe that my whole body cramped up, and I had trouble getting out of bed after having dealt with the other side effects, e.g., hot flashes, weight gain, and a slight change to my personality [I became more snappish, comments less filtered, and less tolerant of some people in my life].
Having said all that, some people have little to no side effects. My advice is to try it, and if the side effects are similar to mine, talk to your onco. Good luck.