I think this is called "Catastrophic Thinking". I have it myself. It's mostly about my health. I have "health anxiety". Things are going fairly well for me for now and it's been that way for a while. But I keep thinking that there's got to be something or an event in the future to dread. There are times when something in the unknown future that I should dread nags at me. I guess I know why that happens. I hate it.

It helps me to keep busy. But there are times when I have idle time and that's when those thoughts come. I try to find something to do but then I can't, so I feel kind of stuck.

I have no suggestions or advice for you. Just saying that it happens to me.