I shared my experience with OCD, and some of what my exposure therapist had taught me, about the painfulness of uncertainty for humans, about how the present moment is the only functional moment, and that if something was wrong, she would deal with it when it happened.
I told her the story a friend had told me about a woman who had breast cancer, and then during a big storm a tree had fallen on her and killed her.
Then I felt bad for telling that story. It's not very reassuring. But it does get at the conundrum of being human, the inability to tell the future, the uncertainty even within the narrative of having breast cancer, where something else entirely can take you out. And my friend understood this. She knew I didn't want anything to happen to her, but that I did want her to be able to live her life.
I had a call-back after a mammogram several years ago, and the anxiety sucked. The more I was able to bring myself back to the moment, the more I was able to cope. Uncertainty is painful for humans, and the desire to race ahead and resolve things is strong.
There are times when what I am obsessing about coincides with fears of people around me, and they will reassure me that I "should" be worried, that it only makes sense. But worry isn't protective, and can erode the very life we love and are afraid of losing.
My friend was fortunate to be at a mammogram center where the radiologist reads it while you wait, and it was fine. This is compassionate care, mitigating what uncertainty can be mitigated.