Yes, this is a big problem for me. Sheltiemom, I also have OCD and I find this to definitely be part of the package, especially when I get stuck in my head ruminating on obsessive thoughts.

I am trying to be more mindful of it. I found a phrase that helps me when I repeat it to myself is "there's no emergency until there is an emergency". It seems like stating the obvious, but when my fear response gets going it's a way of talking to myself and reminding myself I am catastrophizing. Actually this is how I helped myself with the flight anxiety I was telling you about. Usually if I have gone from the situation in the here and now and made 100 assumptions that "might" happen and then ended up at the worst possible scenario as my conclusion I know I am catastrophizing haha.
I've gotten better at catching it when other people do it now, too.