This would include proper diet, rest and includes exercise (good for calming anxiety AND
preventing heart disease!), then add meditation, yoga, deep breathing, spirituality, etc. You can consider adding counseling with a professional such as psychologist or counselor/therapist and learn triggers, coping skills, etc. And then there is the medical route. Your doctor can point you in the direction of a therapist and talk to you about medication if you can't combat this yourself.