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Vaginal cancer is rare but still a possibility and needs to be evaluated ever so often.
It seems there is no consensus on this topic. It is a part of your healthcare and should be done occassionally. I also had endometriosis and this is the reason for annual exams. It is a minor inconvenience for the peace of mind. Regarding the night sweats, I have had none when I was on a higher dose of estrogen but because of breast discharge, my doc has dropped the dose.