What Causes Pain In Joints And Hot Flashes While On Anastrozole?

HI MY QUESTION IS ,THAT MY ENCOLOGY PUT ME ON THIS MED .TO TAKE AFTER MY BREAST CANCER TREATMENT OF CHEMO & RADIATION THE MEDICATION IS ANASTROZOLE 1 MG TABLET I HAVE BEEN TAKING THEM FOR TWO MONTHS NOW. AND I M FEELING SAD, LOTS OF PAIN IN MY JOINTS , HOT FLASHES . THE PAIN IN MY ANKLE ,LEGS AND ALL OVER IS NOT LETTING ME FUNCTION ,EXERCISE, WALK OR STAND TO LONG ,I MENTION IT TO MY DOCTOR AND SHE DID SAY I WILL GET SOME SIDE AFFECT BUT MAYBE NOW IS BECAUSE IT COULD BE SOMETHING ELSE . TO GO TO MY PRIMARY DOCTOR . I AM 81 YEAR OLD AND I DONT WANT THE CANCER TO COME BACK . BUT THIS IS NO QUALITY OF LIFE . WHAT WOULD YOU SUGGEST ? THANK YOU FOR YOUR TIME AND ADVICE