@KMAC46
Dear oh dear! You have certainly got yourself into a spiral of anxiety. I am sorry you feel that way.
Before this diagnosis what worked for you when your anxiety comes to the forefront. Is that something you can draw on.
The day I was diagnosed, it was at Breastscreen, they had a Psychologist speak to me. She suggested that if I started to feel overwhelmed then start patting myself down, legs and arms and saying this is me which brings you into the now.
I found the biopsy process unpleasant probably as it all happened within an hour of diagnosis and no time to prepare mentally.
From what your opening comments say you have managed to get through diagnosis and surgery and you have clear margins.
You deserve a woo hoo, good on you!
Perhaps draw on that strength as this next phase of treatment starts.
Lots on here have experienced your regime of treatment.
We are here helping each other through.
Best wishes for Tuesday
Take care