Just want to talk and get some advice

I am one year post mastectomy and nearly one year post chemo.  Hormone positive cancer, so I am on hormone treatment.  I have really sailed through all my treatment.  I am a very physically fit and active 57 year old.  For the past month I have begun to experience pain in my joints, after waking up, after sitting down even for a short time.  I feel like I am 105!  I am usually a highly functioning person but today, its getting to me