And are you now taking Arimidex? Oh, friend, you have just put yourself through major physical, mental, and emotional stress. Of course you are tired. Let yourself rest a bit now. Do what you can and what interests you.
If you feel that some of the fatigue is related to depression, be sure and let your GP know. I would let my onc know at my follow-up visit about the fatigue, as well. It could be anemia. The strength part you will have to build back slowly. I walked, swam, and practiced yoga. All have helped me be better, be more energetic, and feel better.