Hi and welcome to MM
I think you should seek a second opinion about HRT - I'm not clued up on this but can womb cancer be oestrogen receptive???
You only need oestrogen and I believe women who have had a hysterectomy are actually less likely to get breast cancer if they use oestrogen - I thought the long term study showed that hysterectomised women were slightly more likely to get breast cancer if they don't have oestrogen?

. However that may depend on why they had a hyster in the first place. I still think it's worth researching this more as you are very young to be oestrogen deficient and you need to have your heart and bones monitored. It could be wise to use local oestrogen if you are getting vaginal dryness and your bladder function isn't as good as it used to be - do check this with your doctor.
I would have thought that oestrogen would be good for you right now - for the long term benefit of your bones and heart and also to reduce these horrid meno symptoms.
If oestrogen is really not an option for you then do look under non hormonal prescription treatments at the top of this page, under TREATMENTS.
Keep us posted. DG x