You said, "I had my surgery" Did you have a double mastectomy, Lumpectomy...? Is this ductal
breast cancer?
I really think you should get all the diagnostics your are waiting for before you just do something that is treatment (radiotherapy) that is irreversible. I am saying this because, you said you have 5 sessions and "hopefully" that's it. So it sounds like the condensed treatment called Hypofractionated Radiation which is what I had to my arm pit in late Dec2022. It's done some damage to the tissue (necrosis), including my upper left lung has some sclerosis. Make sure the technicians are experienced , I had two (the radiologist was not there) that were disagreeing on what was either the placement or duration or... in ftont of me in the dark.
I am pretty bummed about this and think that is why there is some of this damage. I think it's best to get ALL yr questions answered , get all diagnostics, stats on yr cancer and even get a 2nd opinion. I didn't have the experiences I've had now, and have been fighting this disease off & on for 12 years. It is not easy I know to keep Drs. wating or yourself.... and I had young children at the time and it was difficult to decide what to communicate, & I still am not burdening them with my current status.... Hope you get the best careful care possible!!