If you have been injured in an auto accident, you can be compensated for anxiety that rises to the level of “Mental Anguish”.
Anxiety (or mental anguish) is evaluated on a case by case basis. You would likely need to show that the nature, duration, and severity of the mental anguish substantially caused a disruption in your daily routine.
Thus, one would need to support an allegation of mental anguish with outside evidence, typically witnesses such as doctors and/or mental health professionals. Additionally, there is no set formula for a reward of mental anguish.