Hi, I had treatment for grade 2 breast cancer last year which was in one lymph node. I had a lumpectomy followed by radiotherapy and have been on anastrazole since, which I need to be on for 10 years (I'm 62). I have recently been getting pain in my ankle, knee and elbow (flashing pains), on the opposite side. It is starting to make getting out of bed more difficult. Is this likely to be caused by the medication, which I've been on for 6 months? 

Thank you