Reciting or listening to Surah al-Baqarah removes fear and drives away the devils from the home and purifies the negative atmosphere from the home.
Recital of Ayatul Kursi, Surah An-Nas and Surah Al-Falaq as well as the last two verses of Surah Al-Baqarah will protect you from nightmares and evil jinns and create feelings of being in Allah's protection within the heart.
Take precautions in guarding yourself against the shaytaan's by closing windows, doors and not going out for at least one hour after maghrib - when the devils come out to roam.
In general, increasing ibadah will strengthen your heart, mind and body. Eat less. Don't over sleep. Don't talk unnecessarily and adhere to the Quran and Sunnah. Not only will these actions remove unreasonable fear from your mind, but will also help you control your anger better. Also avoid programs which at first glance seem innocent but in fact are filled with haram actions. One example is 'Come Dine With Me' and similar. Outwardly about cooking, but contains massive doses of backbiting, insulting, lying, flirting, cheating as well as women who aren't covered appropriately. I mean, with any program, why watch it if it contains all that is prohibited to us?
Do read, read and read more on anything to do with Islam and read 'The Medicine of The Prophet' and watch Islamic programs. I can't recommend 'The Medicine of the Prophet' enough. InshaAllah, by increasing in rightful actions, not only will your life become purer, you will find your mind is clearer, your speech is effective and the best part is, you become more conscious of Allah's commandments, His Rasul's (saw) sunnah and your own faults and wrong-doings. As a humanbeing, you will always have the capacity to feel fear, but inshaAllah, you will find it no longer oppresses you.
