Mindfulness is not meditation. It is just being in the present with no judgement. My ruminating thoughts and looping memories were so bad I had to start out with talking out loud what I was doing. "I am opening the car door, I am putting the keys in the ignition, I am opening the garage door, I am turning the car on............you get the idea. I could only handle this for 30 seconds at a time. Eventual I could do it for longer. It was enough to give my brain a chance to rest until I noticed there were more times I was naturally in the moment and had no flashing memories.