Just had all clear on mammogram after having breast cancer a year ago. I have though for the last couple of months had the most horrendous pain in my upper arm. I can not do anything without it hurting severely for eg get dressed. It wakes me at night if I I sleep on that side. The pain starts at the top of my arm, not the shoulder, and then runs down to my elbow. I am on letrozole and know this can cause all kinds of aches and pains but this really is becoming unbearable. I worry that I have bone cancer as it is in the same side as where I had breast cancer . I had lymph nodes removed which were clear but my arm put has been aching/throbbing so that’s worrying me. When I mention my concerns I always seem to be told it’s a side effect from surgery, radiotherapy etc so I haven’t mentioned this one to my breast care nurse . I also have low bone density as it is and have broken 2 toes in the last 6 months just by stubbing them so, I am really worried. Am I overthinking things?