I had breast cancer in 2018 , and had a Mastectomy, some lymph nodes removed, chemotherapy, and radiotherapy. I am on Anastrozole and also Levothyroxine. For the past week I have had lower back pain which is usually worst in the morning , also had a few days of headaches , feel ok apart from this, could this just be a side effect from the medications I am on , or should I be concerned?
