Oh my gosh - you've been thru ALL of them!! I've had all except Tamoxifen - starting on Letrozole (gave that the boot after 6 weeks) then Exemestane for 6 months & currently on Anastrazole for 4 years & going 'OK'.
Yes, the exhaustion but for me, the aches & pains & difficulty doing day to day things & my kayaking & fishing, things I love doing is what made me stop the first two. My sleep was also BADLY impacted by the first two, less so with the Anastrazole .... and I take Medicinal Cannabis Oil to help me sleep & take the edge of the lesser aches & pains that I still have.
Take care & all the best xx