start Herceptin same time as Radiation?

[Anita]

I'm Stage 1, multifocal medullary bc, grade 3, no node involvement, er + 15%, her2neu3+. I've finished chemo - 4 A/C, and will start rad 11/28 (33 treatments). Originally, my doctor had told me we would do the radiation first, and then Hepceptin for a year and then Tamoxifen. Last week she said we would start rads and Herceptin together - but mentioned it might make symptoms worse. Now I find myself wondering if this is a good idea - has anyone gone through both of these treatments at the same time? I'm wondering if this will make the rad burns worse? Maybe I'm worrying for nothing.
Anita