i think you have to learn how to relax at times when you get too anxious. sometimes it's all in the mind and the things you fear aren't really happening or has happened in the past. but i understand you because i'm like that too especially when my anxiety overwhelms me and i forget to breathe. that should be the most important thing you should do. take a deep breath once your feelings come back. then give yourself comfort in anyway you can. consciously go away from your stressors. it's not going to help you if you keep on staying or doing things that won't give you the best relief.
rationalize what you did in the past... tell to yourself that you just did what you thought was right and best. and believe it. do you mind if i ask you what specific past issue was that?

: )