You and I are the same, except I was diagnosed later in the year in October. Mine did have node involvement and my treatment was mastectomy left side, auxillary clearance, 4 lots of chemo and now on Tamoxifen. I am awaiting the results of my mammogram and ultrasound and find out on the 7th of next month. I guess if there was anything too unusual they would have bumped up those appointments. I know there is what they call a cyst in the breast but the radiographer didn't sound to concerned about it. Hoping I slip under the radar and go another year without it coming back.
Probably the only good news of yours being a second primary is that it isnt a secondary one. You did it once girl and you can get over it again. If it was me, I would just do the mastectomy however I am 55 and only have the tiniest boob ever. During mammograms they have trouble getting enough to flatten for a picture. I have found the best treatment is the one the woman chooses for herself. We usually get it right. <3