I assume moving out of the house is not an option.
Here is a good place to start:
Do some digging, and you will also find their Spiritual Warfare Prayer Catalog. I can tell you with complete certainty, the Hedge Prayer works. But it’s just one weapon. You will very likely need to build up an entire arsenal. Someone mentioned the St. Michael Chaplet. This works, as well, if prayed fervently, and daily. You probably won’t notice the effect for a while, but if you ever stop, you may very likely see what you’re missing. You can pray it on a regular Rosary.
If you are Catholic, attend Mass and confess often. The Sacraments are everything the Church says they are, and more. Unfortunately, it took me many years to understand this.
Divine Mercy Chaplet. This is powerful as well, and can be prayed on a regular Rosary.
Recite the Scriptural version of the Way of the Cross. This too is a powerful form of prayer.
Buy at least two Rosaries, and have them blessed by a Priest. Wear one around your neck at all times except bathing. Look in to the Brown Scapular as well.
If you really want to go thermonuclear, buy a nice statue of Blessed Mary, have it blessed, and keep it by your bed. Buy two or more Crucifixes, and have them blessed as well. Hang one over your bed, where you sleep. Sleep with a blessed Rosary in one hand, and a blessed Crucifix in the other.
Pray at least every morning and every night, for yourself, your family, your friends, etc. Pray to Blessed Mary, and ask Her to guide you.
Find a Priest who knows how to exorcise water and salt, not just bless it. Once he exorcises both the water and salt, he can mix some salt with the water, and say a third blessing over the combination. THAT… is Holy Water at it finest. Also, shake a moderate amount of exorcised salt on your supper, or in a glass of drinking water. This little added touch really helps.
Above all, I would look at this as an opportunity to come closer to God, and hopefully to Blessed Mary as well. Things may even get a bit worse at first when you begin to fight back, but persevere. Consider this a gift from God. And persevere.
Sorry for any typos. Long post, and it’s late.