First, Talk yourself down. "I want to feel more relaxed. My (feet,legs,torso,arms,head) are relaxed. My (feet, legs, torso, arms,head) are very warm. My (feet,legs,torso,arms,head) are very heavy." repeat three times per phrase and body part.
Secondly, begin to meditate. This helps you to control your body so you can prevent it from racing in thoughts and breathe. Just close your eyes, sit comfortably, and breath in and out. This is easier to learn when you're a bit relaxed and will eventually help in the midst of stress and anxiety.You can take a free 10-day course almost anywhere in the world through Dhamma dot org.
Thirdly, try White Sage you can burn it in smudge cones, smudge sticks, or spray it in a hydrosol. The smell is calming and soothing. You can order it online from Lucky Six Farms.
The most important thing is to know that the stress and anxiety is in your own mind, and just the same way you trained your mind to read, you can train your mind to be calm and relaxed. You deserve to be peaceful and happy no matter what happens.