If you suffer from panic attacks, remember that “what if” thinking can turn mild attacks into severe ones. Practice self-talk you can refer back to, when you feel an attack coming. Some examples include reminding yourself that these feelings only last a short time and you can handle it, or that they will go away soon, just like they always have. Other helpful tips include avoiding caffeine and other stimulants, and learning diaphragmatic breathing. One type is yoga breathing, during which you take a slow deep breath, hold it for a period of about five seconds, and release it slowly. This will help normalize the carbon dioxide levels in your blood and calm you.
Read the entire article here: Stop a Panic Attack: What to do if you suffer from panic attacks?