I've suffered notably from sore nipples and breast pain, but also had Bicalutimide to go with the RT. TO counter it, the onco gave me RT to both breasts, but it seems it wasn't that effective. Latest suggestions are Ibuprofen gel (sticky chest!) or Tamoxifen 20mg daily. As you don't mention any ongoing HT, seems that Ibuprofen gel might be worth a punt.