Looking for your experiences with Brachytherapy for Breast Cancer

Diagnosed 3 weeks ago with IDC, estrogen and progesterone positive and Her2 negative. Grade1. Only 3mm on ultrasound/3D. Fine needle aspiration under arm lymph nodes came out negative. So they say everything is in my favor...hoping so. Currently they are saying lumpectomy with Brachytherapy for 3-days after surgery next month. My son is soon getting married and have many events the week after surgery. Would like to hear others that went through this similar treatment on how you felt physically the week following the procedure?