Tamoxifen and the Menopause

Hi Everyone
I’m posting on behalf of my Mum (who has zero computer skills! ) She is about to start radiotherapy and about to start taking Tamoxifen. It has been 2 months since she has come off of her HRT so all the side effects such as hot flushes etc seem to be happening, although the main one at the moment is (from research this is what it sounds like due to lack of oestrogen) is the bladder dropping and pushing onto her vagina (she had a hysterectomy so she feels a constant pressure).
Does anyone have any similar symptoms or know what she can take/do to help relieve this?
Many thanks
Hayley (and Jill)

ps - the hysterectomy was over 15 years ago (should have mentioned that)