You've got that pit in your stomach.
You're worried, anxious, unsure.
You're going over every possible scenario in your head, making assumptions, creating narratives that don't really exist in the realm of fact, and you feel like if you sit there one minute longer with those thoughts swirling in your head, you might punch someone/something, burst into tears, or both.
You've tried to talk about it with friends, this thing you're struggling with, and it helps some to air it out. But it's still there, lurking, the thing you can't solve, or can't know, or can't resolve.
While it's probably beneficial at some point for you to sit down, dig deep, and get to the root of what ails you, you're already too keyed up, and hell, even if you had the discipline to still yourself and paw through your own mess, where would you begin?
So stop thinking for a minute and move. Move, dammit.
Get up, get out, create something new. Hit the treadmill for 30 minutes, or face that work project you've been dreading. Do something mundane and rote--but productive--for the next half hour, and see what happens.
Clean your kitchen, focusing on all the little nooks and crannies the rag misses in your regular cleaning efforts.
Take a walk, focusing on the sound of your feet on the pavement or grass, the way the late afternoon sun filters through the trees, the way the air smells crisp and clean.
Get outside of yourself for a minute. Do something that makes you proud of what you've accomplished, even if it's just checking a thing or two off your to-do list: changing the oil, cleaning out your closets and donating clothing, organizing your docs on Google Drive.
After a half hour, re-evaluate. See what happens when you give your brain a chance to think of anything other than the thing you've gnawed to death for the last day.
You might just find that the thing you're looking for, the answer to your problem, or even just the clarity to move to step two, is right within your reach.
So get up and go. You've got this.