sideblinded, thank you for your reply. I usually try to distract myself but depending on strength of compulsion it may come back. Sometimes I sit down and look at it rationally. But the problem is that nothing we do is 100% safe. Nothing in life is. So when I'm anxious (that day had an argument with mom), OCD gets worse. Since I feel more tense and uncomfortable, suddenly the thought of getting sick or dying becomes more intense and more real. When I'm happy or in a good mood I don't think about those things. OCD becomes mild.

That's why I like certainty and why I was for a while drawn to religion. I don't want probabilities and percentages. Like there are always exceptions. Usually the things that really trigger me are those incidents I hear about where unexpected things happened, like somebody catching a rare virus, or a routine surgery going wrong, or a car's brake suddenly stop working in a highway. They don't happen often but because they do happen it becomes like lottery, IT COULD BE YOU!