The Most Important Thing to Remember When You're Under a Lot of Stress?

The most important thing for you to remember when you're under a lot of stress? I'm just scared. Hum i'm just perceiving a threat to my security, my control or my approval because i've left. The more i can be in the present moment, rather than in an imagined future that i'm scaring myself with and trying to respond to,  the more effective i'm going to be.