The article posted by @primek has been a lightbulb for me. Thanks @primek! About 3 months post bilateral mastectomy and DEIP reconstruction, I experienced really sharp pains in my upper ribs - both at the front and the back which worsened when I coughed or sneezed and I was unable to move my head/neck. This persisted for about 4 weeks but the symptoms in this article matches excitedly what I was experiencing. Now - the pain comes and goes... it’s mostly dull, but I do have days where it’s sharp.
@Shan_07. I am on the same hormone treatments as you (and along with surgery had chemo and radiotherapy). In addition to the above that I just mentioned, I also get joint pain in my feet, ankles, knees, fingers and wrist.