If the radiation oncology nurses aren't helping, do yo have a breast care nurse you can talk to? I'm sure there are options out there but they can be hard to find. Even so, the R/O nurses should be familiar with what is available. Having said that, I like the suggestion you had from a doctor much more than what your radiation nurse said.
Once you remove a dressing, you're increasing your infection risk by putting that same dressing back on, I would have thought. I agree with @primek, maybe a few days in hospital, or with community nurses coming to you to chage the dressings would be beneficial
Hope your appointment tomorrow goes ok
Take care
