Hi @Newymum 
Have you read up on Hormone therapy - link to BCNA website
Hormone therapy and breast cancer (bcna.org.au)I had bleeding issues when I started on Tamoxifen and ended up under a  Gynaecology Oncologist.  
My Medical Oncologist put me on Tamoxifen and Zoladex - Zoladex injection, total of 24 to shut down ovaries.  My Zoladex was able to be administered by my local GP.
It's a little daunting but certainly doable
Another link
Ductal carcinoma in situ (DCIS) | Breast Cancer Network Australia (bcna.org.au)Best wishes as you read up and get a better understanding of your situation