A person who suffers with heart palpitations should read the following verse alot:
بِسْمِ اللَّهِ الرَّحْمَٰنِ الرَّحِيمِ الَّذِينَ آمَنُوا وَتَطْمَئِنُّ قُلُوبُهُم بِذِكْرِ اللَّهِ ۗ أَلَا بِذِكْرِ اللَّهِ تَطْمَئِنُّ الْقُلُوبُ
Also write the above verse on a blank piece of paper in the state of wudhoo facing the Qiblah and hang it around the neck in such a manner that the Taweez hangs around the heart.