I cannot take any of the AI’s due to severe side effects, while I had no side effects of tamoxifen. You May wish to ask you oncologist about faslodex. It is a shot once a month and the only side effects I have experienced is fatigue for two days and an occasional mild hot flash. For insomnia try CBd, and if you can get medical marijuana try to get the CBd with thc. It helps with sleep and anxiety.