I Had A Breast Cancer And I Have Lumpactomey And

I had a breast cancer and I have lumpactomey and I have five days of cemotherape and the onglogest gave me to take the drug letrozole tab 2.5mg but it gave me very bad hotflashes and I told my family doctor about that so he change it to anastrozle tab 1mg and I read the articale about in the medical report and I thought it doesn't do any good so I stopped taking any of these med I do mammogram once a year and Mir once a year can you advise thanks a lot