I have been taking Anastrozole 1 mg for 2 months, About a month ago I had a loud pounding in my ear while sleeping and it continued for about an hour after I got up, never had this before. Was this a side effect of the drug? I have not noticed any other usual side effect and the pounding never came back. My dr gave me an echo cardiogram to be sure it was not related to heart..that came out showing normal.