Yes, I have done this. I have done it more than once, but maybe the worst time was when I was going through a breast cancer scare. The time from when I found a lump and when I got the results of the biopsy was about 5 weeks. At the height of my anxiety, I started developing pain in my ribs and skull. I think the skull was from clenching my teeth and holding my head so tensely. The rib pain was phantom pain, I believe, from imagining that I had cancer that had already metastasized. I remember listening to NPR one day, and the topic was disease, and every time the guests would say "disease" I would get a shot of pain in my bones. Couldn't be clearer that the pain was pure fiction triggered by fear of disease!!