Anyone taking Aromasin? I've been on anastrozole (Arimidex) which caused severe splitting headaches and was then started on letrozole (Femara). On that I began having severe joint pain in feet wrists, elbows, and worse yet the knees as well as severe fatigue. Oncologist is giving me a 3-week break off and then am to start up on Aromasin. Here we go again!