4-5 weeks of radiation is normal protocol. I had a lumpectomy for stage 0 DCIS in 2011, followed by radiation – no chemo, no medication. Radiation gave me extreme exhaustion, for sure, but the ComfortSling I wore beneath my breast gave my skin awesome protection: By my treatment’s end, my skin had darkened slightly at the radiation site, but was otherwise unchanged. I had no pain, no broken skin. If the radiation is directed to the underside of your breast, the ComfortSling will make a huge difference. The exhaustion is difficult, but it, too, will pass. Good luck!