Asymmetry

I have not been on this site for quite some time and I am terrified that I have to be here again. I was diagnosed with stage 2A ER/PR+, HER2- breast cancer in 2016. I went through lumpectomy, chemo, radiation and am on my 4th year out of 10 on a hormone blocker. I have been cancer free since finishing treatment. 2 years ago, after my mom died of pancreatic cancer, and her sister was diagnosed (and has since passed) with stomach cancer, my oncologist decided to do genetic testing. It came back that I have a the PALB2 mutation. My oncologist told me then that as long as I'm on the hormone blocker I'd be protected. I have a yearly breast MRI, followed by, 6 months later a mammogram. I have been all clear this whole time. I had a mammogram this week. The report came back that I had asymmetry in one breast, (the one where the cancer was), and they are wanting me to go back for further imaging and ultrasound. I talked to a supervisor of the imaging center and she told me that she is relatively certain that this asymmetry is cancer. She was looking at the pictures and there is definitely something there in two different spots. I asked if it could have been an error on the technicians part, maybe being positioned wrong, or the compression was incorrect. She said it is not possible for that to happen. I also had my bi annual blood work this week that my oncologist ordered. This included two tumor marker tests. Everything was completely normal. As you can imagine, I am terriried of another cancer diagnosis. It was a horrific experience physically and emotionally 5 years ago. It is no easier hearing this news now. Has anyone been told you had asymmetry and how did it come out? Benign, or did you have a cancer diagnosis? I am literally sick with worry.