The psychology and physiology of fear are often linked. Grounding techniques found in some forms of meditation can help manage the physiological symptoms of fear, such as a racing heart or sweating, which can in turn reduce psychological fear.
To practice grounding, sit in silence for a few minutes and notice your breathing. Slow your thoughts down and try to focus on your breath.
Sit and count your breath for approximately 2-3 minutes.
Exercise:
Before posting online or speaking, perform a grounding exercise. This can be as simple as taking ten deep breaths, focusing on the sensation of your feet on the ground, or holding a comforting object. Bring your mind to silence before you post.