Answered by Sayyidi Habib Umar bin Hafiz (may Allah protect him and benefit us by him)
I feel pain and constriction in my heart when reciting adkhar. What should I do?
This is due to two things. The first is the effects of darkness in the soul due to sins and heedlessness. The way to combat this is to persevere with the adhkar until the darkness is removed and the light is manifested. The second is the presence of devils (due to black magic, the evil eye or other things) that attempt to dominate a person’s heart. Again the person should persevere in reciting the adhkar because this is a means of treatment.