Good you've updated.
I'm still not clear if you are in the UK or US?
One reason was you aid 'gyno' which is often used in the US.
It's very poor that you've not been given much information and you say all you're getting now is a phone call to discuss this.
You should have a full report of the biopsy- the thickness of the lining, the type of cells and the treatment plan. (which cannot be just stopping hrt.)
As other posters have said, there's so much more we'd need to know to help.
It seems you're not being told anything. You should have given full consent for a biopsy, and it ought to have been explained.
If you have had a biopsy you need to know if it's simple or complex hyperplasia.
'Changes' would suggest your biopsy has shown atypical cells.
You also need to ask why you've developed hyperplasia if you've been using HRT as prescribed.
What HRT do you used? You've mentioned estrogen but which progesterone do you use as well? Are you peri or post meno? Do you use the progesterone daily or on a cycle?
I don't understand the lack of information you've been given.
There is no way you should just be having a call with your specialist - this needs a face to face consultation and a discussion of all the pros and cons.
For information, women who have stage 1 endometrial cancer are able to use HRT again. So there is no reason why you need to stop your HRT if your hyperplasia is treated.
Do your own research on it- it's all online. Yes, estrogen makes the lining grow but a Mirena coil stops it.
The treatment is usually the Mirena coil and that means that you can probably use estrogen again when the lining is normal.