Hi Heather
I had a similar problem after my surgeries. I have been seeing a great physio for a while now and she has really helped. My oncologist referred me to her as she works with a lot of breast cancer patients. Are you in Melbourne? I can give you her name if you are. Otherwise ask your oncologist, surgeon or breast care nurse if they can recommend someone. My GP also gave me an EPC (I think that's what it's called) which allows me 5 free visits to the physio - fully claimable through Medicare.
Ann-Marie x