Hello
I need to say I do not have the same symptoms as you, I am sure someone will be along who may have experienced much the same. But you understandably sound terrified.
I believe I have seen previously that you suffer with health anxiety, many here will be able to understand your feelings.
You need to understand your courage in being seen by the medical profession, this is a huge thing for You to be able to do. You yourself have found the strength to do so, you have taken back some control over your anxiety.
I am age 57 and if not for the mirena coil I would still be getting 4 weekly bleeds, my periods have yet to stop. I still get pms symptoms so I know I am still getting the cycles, periods at out age is more unusual but not unheard of.
I think there are several women on here who have undergone uterine biopsies too. Helpfully they can postcode of their experiences.
Whilst I can't give advice on the proceedure, I just wanted to remind you that you have taken a good step to be seen, that takes some courage to do so.