I don't know your whole sitch but I do recognize something that I went through when my W came back. There seems to be a lot of tension. I would work on detachment (such a DB thing to say)...but seriously just calming down would be huge.
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Even when I exercise or socialize I am constantly thinking about my M. It's unhealthy and I don't know how to break the cycle.
Have you read DR? Do you remember the "stop sign technique"? This is great way to start controlling your thoughts.
Just remember that you control your thoughts. Have that attitude, dominate your thoughts, direct your mind. Be cerebral about this for the time being.
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I then read too much and overwhelm myself.
This doesn't appear to be working. Is it within your power to change it?
Look what you've been through already, how can anything in this life ever scare you after that? You've already shown so much resilience but now you're letting little things get to you? We tell ourselves funny stories sometimes! Tell yourself the story about how strong you are and how you're still learning and growing and pushing and that you will be happy.
H 34 W 29 BD 3/12/18 Divorce Busted Spring 19
It is not things that bother us, but the stories we tell ourselves about things.