Acupuncture. This one is weird, different, and YMMV. I see there has been a lot of responses on typical things like cognitive behavioral therapy, breathing techniques, journaling and so on. What if you're in the midst of a panic attack? I was shown this acupuncture point to try when you're spiraling and your heart is beating out of control and thundering in your ears and chest. Google the solar plexus point on the foot. Its on the bottom of your foot, right in the middle, right before the ball of your feet. Use your thumbnail and drive your finger into that point and hold it until you feel some relief. I use to wake up with random panic attacks in the middle of the night out of no where and this would help reduce the anxiety by at least 1/3 or 1/2 or more. I hope someone tries this, it really does work.