I came across this article recently that’s about a mom and her daughter’s O.C.D. It’s very interesting and would probably provide some insight for someone who doesn’t struggle with it.
I’m not exactly like the little girl in the article (I was much older before my symptoms started troubling me, I’ve never had the something-bad-will-happen thoughts), but I still think you should read it. Also, please notice the little illustration included in the article as I think it does a very good job of conveying what O.C.D. sometimes feels like.