@Lostguy21 I refer to it as having my head on a swivel.
Time is your best friend with it.
Understanding that it's a natural fight/flight/freeze reaction on steroids clicked the "I'm not totally losing it" lightbulb.
Learning to be mindful of it is helping me more than anything. I don't always know when it's happening but I'm learning to recognize it sooner. Then I actively start working to calm it down. Not by fighting it but by looking for the stressors. "What is pinging my radar?"
If there's nothing present in the present, it will notch down. When I've reached a more "normal" point, I can start looking backwards to what may have triggered it. When I find a possible trigger, I file it away in my mental database. After that, it's time and work.
Even if I can't figure out a trigger, just having the present "be ok" helps tone down the hypereverything.