Cancer Anxiety

anna
I found a lump at the weekend. I'm 15 so it's statistically unlikely to be cancer, and I've gone and got it checked out, she thinks it's a cyst but I have to go back in two weeks to see if it's grown. Basically, I have anxiety disorder and am struggling not to have a panic attack about the whole ordeal during my mocks. Any tips on calming anxiety in an exam, or any stats about cancers that will make me feel better?