EFT. A really effective treatment for anxiety is "tapping" or eft (emotional freedom technique), which involves the (gentle) sequential tapping of acupressure points on the face and trunk of the body. Some suggest that tapping activates the parasympathetic nervous system ("rest and digest"), but the exact mechanism of action is not really known. There are lots of online videos demonstrating "how.".
Stop panicking. First, it's important to know that, as far as i know, no one has died from an anxiety/panic attack. Your doctor may prescribe medication for anxiety attacks. If anxiety is frequent, anti-depressants have been found to be beneficial in decreasing their frequency and severity. Counseling may help find triggers, relaxation techniques, etc.