Yes. This isn’t just a Bipolar issue it can and does happen mental illness or not.

I also lived most of my life always expecting the worse so when things worked out ok it was a nice surprise....

But I have worked though that in therapy and no longer think like that I’d say 90% of the time.

My husband said he has never had any catastrophic thinking and I believe it ! he’s very much in the moment, take one step at a time kinda guy, he also can lay down and be asleep in literally 1-2 mins. He might be an alien