Rumination comes from a term referring to a cow chewing over something repetitively and at length. We do this by thinking and re-thinking and thinking again. It looks different for everyone.
For me, rumination came about because I was feeding it with information on social media. Every day I would do my routine which, in retrospect, looked like "digging for pain" looking for the results I was afraid of, confirming my suspicions, and on and on. I would think about it all, endlessly from morning to night. I knew it wasn't normal and I hid my pain from everyone.
When I look back on in now I can't believe how long I endured it.
Here's what helped:
Every night before bed, I started listening to this:
A Micheal Sealey mindfulness mediation. It helped me become objective about the thought forms in the state of rumination and thus helped me take the power out of the anxiety episodes.
after using for many nights in a row, falling asleep to it most of the time, I was able to recognize what was happening and decidedly "not follow" the emotional road beckoning from the thought forms, if that makes sense. So the thought would appear and I would say to myself, "there it goes again."
THE MOST HELPFUL thing I did was to eliminate the core issue fueling my anxiety. I know sometimes it seems impossible , i.e. you can't eliminate family members but what you can change is the way you engage the things that start or perpetuate the cycle.
Best of luck. Keep coming back to the forums.