When you feel yourself ruminating about the past, what do you do to snap yourself back into the present?

I'm having the hardest time right now with my own ruminating negative thoughts that may or may not possibly come true. I fear the worst and replay what that looks like in my head over and over. The best I can do is my best and wait for the horror to end. I want to cry, but can't. I'm scared and alone in my head. My anxiety is extreme. What should I do in the meantime while I'm going through this? How can I minimize or stop the way I'm feeling? Please, I need help.

Advice needed please: Has anybody ever been in a situation where something traumatic or heartbreaking was happening in their life and struggled with rumination? I know there is like a normal amount that you should process something and cry it out but I don’t know that it is conducive to anything to do that on and off for hours? Wouldn’t it at a certain point be considered unhelpful rumination? And if so how does one stop? Because I’m going through something so hurtful and confusing that I don’t know how to stop thinking about it and the usual distractions don’t work for very long. And idk how important this is but it just happened today so it’s very fresh which makes it even harder to not think about and “figure out” why x, y, z happened. Goodness, I’m sorry if I’m weird or a baby

What's a piece of advice you give when someone has constantly intrusive thoughts and ruminations that won't stop? Interested to see what you tell others.....more on this when I see some replies!!!