Remember first and foremost that fear of a thing by definition gives that thing power over you. You must never give into fear. Fear only gets stronger the more acknowledgement we give it. If what you have encountered is paranormal in nature, than you must be strong both in faith and in spirit. Give God his praises so that He may protect you and your home. Prayer is essential. Abiding faith is necessary.
If prayer is not what you believe in, than a simpler approach may help. Think of words that have strong meaning. These words would be action words. Or descriptive words. For example, an action word like protect or defend. Descriptive words like cloak, or shield. These words when said have meaning in whatever context they are used. Also think of images of love, strength, valor or courage. These also have clear meaning. When you are in a stressful situation think about the above.
Lastly, thinking about good memories of your past with family and friends may create a more peaceful environment.