@sparkyf, I think you might also appreciate these related discussions:
- What Are Your Best Tips for Before and After a Mastectomy?
https://connect.mayoclinic.org/discussion/what-are-your-best-tips-for-before-and-after-a-mastectomy/

- Bilateral Mastectomy without Reconstruction Recovery Timeline
https://connect.mayoclinic.org/discussion/bilateral-mastectomy-without-reconstruction-recovery-timeline/
- What to expect before during and after mastectomy
https://connect.mayoclinic.org/discussion/what-to-expect-before-during-and-after-mastectomy/

- Exercise and Physical Activity after Breast Cancer Surgery
https://connect.mayoclinic.org/discussion/exercise-and-physical-activity-after-breast-cancer-surgery/

Has your surgeon talked to you about exercise and movement post mastectomy?