Just a side explanation, the reason the screening program is being extra cautious is that my Mom's family is full of breast cancer. That has made me, my doctor and the program not unduly paranoid, but cautiously vigilant - I've been flagged by the system, and they want to investigate any change even if its minor.

But I'm confident it's nothing more than a sprained muscle. It was worth checking out here, just to get confirmation that it's a normal part of aging. This is my first major twinge.
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When you don't like a thing, change it.
If you can't change it, change the way you think about it.

(Maya Angelou)