I took anastrazole for 6 weeks. It made me not feel well, always very tired, and a puffy bloated feeling in the morning. My doc had me try Exemestane. OMG! I’ve been on it for 9 days and I feel better than ever. I’m 67, have arthritis and for the last 30 years would get very tired after exercise, so did not overdo it or I’d sleep for 3 days. Yesterday I both lifted weights and did cardio, and no nap needed. No extra joint pain yet. This seems too good to be true, so the effects may change. But you might want to try it.