I started on Arimidex and could not tolerate the side effects. I was switched to Femara about 3 months ago and am still experiencing a lot of side effects. As of late I have noticed severe ringing in my ears along with all the other side effects. There are three tiny bones in the ears. Could Femara or any of the aromatase inhibiters affect these bones too? This is extremely bothersome and is getting worse.