اللَّهُمَّ إنِّي أعُوذُ بكَ مِنَ الكُفْرِ والفَقْرِ، اللَّهُمَّ إنِّي أعُوذُ بكَ مِنْ عذابِ القَبْرِ لا إلهَ إلاَّ أنتَ

Prophet's Guidance on curing Fear and Insomnia

روى الترمذىُّ في ‏(‏جامعه‏)‏ عن بُريدةَ قال ‏:‏ شكى خالدٌ إلى النبىِّ صلى الله عليه وسلم ، فقال ‏:‏ يا رسول الله ؛ ما أنام الليل مِن الأرَقِ ، فقال النبىُّ صلى الله عليه وسلم ‏:‏ ‏إذا أوَيْتَ إلى فِرَاشِكَ فَقُلْ ‏:‏ اللَّهُمَّ رَبَّ السَّمَواتِ السَّـبْع وَمَا أظَلَّتْ ، ورَبَّ الأرَضِينَ ، وَمَا أَقَلَّتْ ، وربَّ الشَّيَاطينِ وما أضَلَّتْ ، كُنْ لَى جاراً مِنْ شَرِّ خَلْقِكَ كُلِّهِمْ جميعاً أنْ يَفْرُطَ علىَّ أحدٌ مِنْهُمْ ، أَوْ يَبْغىَ عَلَىَّ ، عَزَّ جَارُك ، وجَلَّ ثَنَـاؤُكَ ، ولا إلهَ غَيْرُك‏

Tirmizi narrated in his Sunan that Khalid once complained to Prophet Muhammad Sallallaho Alaihe Wasallam that he does not sleep well at night, our beloved Prophet said : "When you go to the bed, say, O Allah ! The Lord of seven heavens & whatever is under them, the Lord of the earths & whatever they carry, Lord of the devils & whoever they misguide, Be my Supporter against the evil of all of Your creations, Preventing any of them to cause me any harm or injustice. Mighty indeed are those whom You Support, honorable indeed is Your praise, and there is no deity worthy of worship except You".

وفيه أيضاً ‏:‏ عن عمرو بن شُعيب ، عن أبيه ، عن جده أنَّ رسولَ اللهِ صلى الله عليه وسلم ، كان يُعَلِّمُهم مِنَ الفَزَعِ ‏:‏ ‏أعُوذُ بِكَلِمَاتِ اللهِ التامَّةِ مِنْ غَضِبهِ ، وعِقَابِهِ ، وَشرِّ عِبَادِه ، وَمِنْ هَمَزَاتِ الشَّيَاطِينِ ، وأعُوذُ بِكَ رَبِّ أنْ يَحضُرُونِ‏

Also Tirmizi narrated that the Messenger of Allah used to teach his companions these words when they faced fear. "I seek refuge with Allah's perfect Words from His anger and torment, and from the evil of His slaves and the whisperings of the devils, I seek refuge with You, my Lord from their presence". Ibn Umar Radi Allaho Anh used to teach these words to his children and would even write them for those who were not able to memorize them. There is no doubt that such words are suitable and effective in removing & repelling all types of harm.