Fear is a huge emotion that we deal with far too often in real life. Of course, I'm a writer, so everything is fair game when it comes to book fodder. I put mine in my books, but not when I'm scared and not usually the same book I'm working on when I'm experiencing the fear.
What I mean is, in the warm light of day, I take whatever fear I had and put it into some story, but change it to break the fear I had.
In one of my Middle Grade manuscripts, I transformed creatures straight out of my childhood nightmares. But, I gave them fur and families and put them in trees instead of the hairless, slimy monsters I imagined lived in the space between my bedroom floor and the garage ceiling. I was afraid if I dangled my foot or hand over the edge, they'd grab me and drag me into their world between the floors and eat me.
My brothers were watching Chernobyl the movie. Thank you horror movie for the book fodder. So, I made them into characters I absolutely love. They no longer scare me. I controlled the way I think about them in a place of safety and in times of fear I go back to the new memory. That's how I deal in a lot of ways.