Such a person can chant the Root Mantra of Mercury, given here in this post- Here , Wearing or keeping an energized Budh Yantra, can also give relief to these people.
If the condition is chronic or the intensity of the feelings and emotions of restlessness and fear are severe then the remedy given below can give relief and make the fear subside.
Remedy- A Chauhah Mukhi Rudraksha Bead should be taken and kept immersed in a glass of clean drinking water for about 10 minutes. Then the, Rudraksha Bead should be removed and the water should be given to the patient to drink. This remedy is believed to give immense relief from restlessness and fear after eating anything.