Mindfulness meditation has allowed me to notice when I'm running a conversation with myself. This is usually on one of a small number of topics and quite repetitive.
Noticing means I can stop doing it in that moment. I may start again next moment, but then I just have to notice it again, and stop again. Awareness of what I'm doing is, I find, really incredibly important. I have found practicing this to help with many problems.
Mindfulness meditation is not about quieting the mind or relaxing. It's about knowing what is happening while it is happening. Many people say they can't meditate because when they sit their mind just gets busy. That's actually fine. The thing to do is just watch it get busy. See what it's doing. Notice the patterns it follows. Be the observer watching your mind. That allows some separation where I can realise that I am not my thoughts. Thoughts are just something that happens habitually.
Over time these things just start to fade away. It does require a daily practice.
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Ever onwards and upwards!