Although it may not feel reassuring to have a pre-cancerous condition, this is good news. Have you been told when you are likely to have your surgery? I was diagnosed with pure mucinous breast cancer 12 years ago and had a lumpectomy. Unfortunately, I had a second cancer the following year and had a double mastectomy. I have never looked back and still lead a busy and fulfilled life - Hopefully, you will do the same.
It shouldn't be long until you get your HER2 results and know whether or not hormone therapy will be effective. I do hope that it will.