Here's a video clip of me and my dog Casey demonstrating Pigeon pose. In panic attacks, I've found that the psoas gets overactive. I've found relief from doing yoga. Poses like Pigeon pose help stretch the psoas so we can get on with our day.
Walking meditation is also helpful during a panic attack. I know it's hard to get out of the house, but fresh air is good for us, and it's also good to use our peripheral vision --most of us overuse our focal (reading) vision with all the electronic devices we own.
Be sure to use soft focus while walking and looking at your feet. Soft focus helps activate peripheral vision, as does noticing what is happening in your peripheral vision.
Another big help is to fit in some high intensity aerobic exercise regularly (during non-panic attack times is best I find.) Think of being calm as like having money in the bank, and being stressed as like withdrawing money.
High intensity aerobic exercise (provided your doctor okays it) puts money in the bank so that you don't overdraw your account and go into panic attack mode. Dr. John Ratey discusses how effective this is to reduce anxiety in his book Spark.
Other things that add to your bank account of calm are yoga and meditation.
Are you in pain? Do you ever get overwhelmed by your emotions? What if there was a quick exercise to help with both? Only 92 seconds until you feel better? Would you use it?
Here's a video of me demonstrating a pain and emotional relief technique. I hope it helps you. If you want to know more about it, it's based on Touch for Health. Touch for Health is specialized kinesiology, which is also known as energy healing. Specialized kinesiology is a simplified cross between chiropractic and Traditional Chinese Medicine using acupressure. I teach Touch for Health, as well as another type of specialized kinesiology, PanHarmonic Healing, which helps release emotions far more deeply and effectively, layer by layer. I highly recommend specialized kinesiology--it's what's helped provide me relief from anxiety, depression, pain, PTSD, and autoimmune illness.