I had a lumpectomy and sentinel node removal. Chemo and then radiation. I had some physio sessions after my radiation treatment and everything seemed fine until about 7 months after I finished treatment and I lost a lot of mobility in my shoulder and had a lot of tightness and discomfort around and down my right arm, despite keeping up my exercises. It seemed to happen very quickly, rather than being a gradual loss.
My doctor gave me 5 physio sessions available on a Medicare plan.
The physio was painful at times and I had some bruising after one particularly intense session on the scar tissue in my arm, but it did the trick and I almost have full range of movement in my shoulder again and most of the tightness has gone.
I keep up my exercises, and will go for more physio if I notice it getting bad again.