Grade 1 Stage 1 ( 1 cm) hormone positive invasive lobular carcinoma

Hi Christina 
i was diagnosed with grade 1 tubular carcinoma there were 2 tumours they got both out through an incision across nipple both were grade 1 stage 1  er+ Pr+ her2- no lymph node activity and clear margins 
I don't need chemo but will have radiation and tamoxifen for 5 years
im glad I don't need chemo but am still worried about having radiation