I agree with the PP. TBH a hysterectomy for endometrial cancer is to save your life. Being blunt. If it's caught early, it's usually 100% curable.
I'm not sure how the biopsy wasn't accurate. I think the success rate is over 97% accurate and it depends if they got a sample from the area that looks suspicious or not- and that can come down to the skill of the surgeon taking it.
It's really important to communicate with your consultant and ask lots of questions.
Lots of women have post meno bleeding but most don't have cancerous changes and if they do, it's staged, so you need to know what it is, if it is cancer.
The stage it's at will influence the type of operation. For example they will have to remove your ovaries and tubes, and they may need to do an abdominal 'wash' or see if there are any other suspicious areas. This can't be done with a vaginal op to my knowledge.
Depending on your age and how far past menopause you are, you may need advice on estrogen replacement because your body would still have some ovarian activity into old age- when they are removed, you lose that.
It's a lot to think about and you need to a) read online as there is info there and b) ask lots of questions and if necessary get 2 opinions if it's not clear.
If it's simple, straightforward operation, the normal recovery is 6 weeks with no driving, no lifting, lots of rest, no standing for hours, putting your feet up and allowing your body to heal internally.
Good luck 