The irrational mind

How does the mind convince you that things are going to fall apart right before something is due to happen? And as soon as it is done, you just wonder why you spent those precious minutes catastrophising in your brain. I learnt that you know. Catastrophising. Apparently humans don't have enough of sadness in their lives, they go ahead and create catastrophes in their heads to get some more. Thats some crazy shit. But apparently that's what we do to protect ourselves. I'm not sure how much protecting that actually does because like I heard in a podcast once, I've had many strokes and heart attacks. All in my head. And I would much rather get out of my head and just appreciate that I'm happy, healthy and not in a catastrophe.