Aromasin

Can anyone help me with their personal experience with the hormone treatment Aromasin.  I was on Arimidex but the side effects were not helpful to my recovery, so my oncologist gave me a few months off and changed me to Aromasin.  Over the break I felt amazing, my motivation to live returned, I re-commenced my exercise routine again and I started losing the weight I gained during treatment.  Now back on the hormone treatment I feel depressed again, don't want to exercise, feel lack of motivation and just want cry all the time and that is in just a week of taking them.  Help