First thing to try is a Sator Rotas Square. Used since early times, two have been found in Pompeii. These squares are designed to prevent and ward against evil spirits.
On a piece of paper draw a grid of six lines vertical and six lines horizontal to form five rows and columns of 25 squares (a 5x5 grid).
In capital letters write a single letter in each square thusly:
S A T O R
A R E P O
T E N E T
O P E R A
R O T A S
This is then placed under your bed, between the mattress and the box spring, near where your chest will rest. Alternatively, it may be placed inside your pillow case.
Write the square on post-it notes place one on each wall and on each window and door.
Next, should this prove insufficient, is a local exorcism. This is a necromantic ritual to remove dangerous or malicious ghosts, effigies, and shades.
Buy:
frankincense and myrrh incense sticks
an ounce of Wormwood,
a strip of Dogwood bark (roughly the size of your first two fingers in length and width),
Cardamom (look in your spice rack or go to walmart),
Verba Maté tea bags (health nut stores have them)
Clove cigarettes to smoke (or cloves and tobacco to burn as incense with the cardamom).
A pot made of iron or steel, half filled with water.
Shred the dogwood into strands or chop it in the food processor.
Boil a 4-quart pot of water and add six verba maté tes bags and half the dogwood bark. Boil for another ten minutes. Then pour tea and add milk and sugar to your cup however you prefer. Drink your cup and use the rest of the tea in the pot to wash your face and body in the bathtub. Don't wash it off untill your ritual is done. Continue.
In an ashtray, ceramic bowl, metal pot, whatever you can burn the cardamom, cloves and tobacco in, do so. Add dogwood once it brings to smolder.
Light the frankincense and myrrh to smolder as well.
Light a clove cigarette and smoke it or inhale the smoke of the cardomom, etc, burning.
Relax and focus on your house and your room in particular. Imagine it as from above looking down inside your house as you would a dollhouse. One by one imagine every door and window locking fortify every wall, panel by panel, brick by brick. Imagine that everywhere you fortify prevents a spirit or ghost from passing through to harm you and your family.
Now work your way, in your mind, from the furthest room away to your room. Fortify every room and closet and hallway until your room is left.
Now lock down your room.
Focus on the pot of water in front of you. This is the only place you allow the ghost/spirit to be. In the water of this pot. Imagine your own soul as filling the whole house. Everywhere but the pot. Imagine pulling anything negative into the pot.
Memorize this beforehand: I, _insert your full name_, command you spirit, by my divine right, in The name of The Creator, to appear before me so that I may see and here you. Manifest before me now, spirit, if you have good cause to be here and tell me so. If I see it fit; you may stay for as long as you have good intentions. If not, in the name of The Creator and in my name, by divine right, I command you into the water of this pot.
Focus on this action. Focus on your whole house, filled up with your soul, grabbing and pushing the spirit into the pot. Choke it and drag it in.
Repeat this if the spirit doesnot appear:
In the name of Michael, watch over this house, purge it of spirits and The Dead. Send them into this pot.
In the name of Raphael, heal all in this home, fortify us from any evil which has entered here. Force it into this pot.
Gabriel, speak your words and silence the spirits in this house. Force them into this pot.
Uriel, stand forth here on Earth and draw the negative spirits and souls into this pot.
By the Creator, I, _insert full name_command this of you, in His name and in mine. Do this and be gone from here with my thanks and blessing.
Put a metal lid on the pot.
Take the pot to a crossroads (where two roads intersect, not your driveway) and toss the water out violently, not pour it slowly. Get no water on you. Turn and repeat this:
I have brought you a soul, God of Crossroads. Take it from me. Let it not find its way back to my home or me. Send it into The Veil.
Walk home. Wash all the walls and windows and doors with a bucket of hot water and the rest of the tea. Wash floors and ceilings too. Focus on removing an trace of any ghost or spirit from your home.
This is what people have me do for them. It is called a Local Exorcism.
Sleep well.