Swollen bilateral axillary lymph nodes post mastectomy

Digezy

I had a mastectomy on my right side only in late June 2021. Had revision surgery 5 weeks ago. My calcium level in my blood has been elevated all year so my oncologist ordered a CT scan and bone scan. CT came back with swollen bilateral axillary lymph nodes. My oncologist wants to see me first thing Monday morning. I had 3 sentinel nodes removed during June's surgery and they were free of cancer. I'm scared it's cancer again. My scans were clear for all kinds of cancers (brain,lung,anything in pelvis or abdomen). I have no illnesses or infection or conditions that would cause enlarged lymph nodes. anyone have any experience with this?
thanks!