Had same diagnosis & did radiation -it was disastrous. I feel it may have damaged my heart. My normally low bp is in the dangerously high range now.
Due to what I’m guessing was medical error, I wound up w/ dripping moist desquamation over the entire breast. It was so painful I considered checking out. My onc: “take Advil.”
I don’t want to scare you, but according to Cleveland Clinic & the NIH, 20-30% will have severe effects. The oncs call that “rare.”