Take control. Establish a regular “worry time”. Start by setting aside half an hour every day. Write down all your concerns in specific terms. For example: “I felt nauseated this morning. Do I have stomach cancer?” Assign a score on a scale of 0 to 100% to estimate how distressed this possibility makes you feel. Next, list all the possible explanations for your concern, then rank each one according to how likely it is to be correct. Make use of external sources if necessary, but stick with reputable websites and professionals. Finally, score your worry for the level of distress it is causing you now. Gradually, you will be able to reduce the amount and frequency of worry time.