Q. If I accused myself of mortal sin and insisted to myself that it was, all the while knowing that I did not have all the evidence I needed and that there was good reason to doubt, was this then a form of slander, which is in and of itself a mortal sin?
A. Can you feel the tension and the anxiety in this question? The convoluted thinking that it represents? This is a good example of the tortured thinking of the scrupulous mind. This is fantasy, not reality. No one thinks this way and honestly believes that it is, in fact, discernment. When you are all tied up in knots over a question, and you are scrupulous, always identify it as scrupulosity, not as reality.
Q. Is it a sin to play football outside in below-freezing weather when you are sick if there is a good chance you might get more sick from the exposure to the cold?
A. No, it is not a sin. It may well be an unwise health choice, but that is all. Not every human decision that may be iffy or even wrong is a sin. Many times, it is just a poor choice, not a sin.