We understand that you are facing a spiritual battle against an evil spirit that is tormenting you. First, we want to ensure that you have a personal relationship with Jesus Christ. It is only through His name that we have authority over evil spirits, as it is written in Acts 4:12 WEB: "There is salvation in none other, for neither is there any other name under heaven, that is given among men, by which we must be saved."
If you have not already, confess with your mouth that Jesus Christ is Lord, and believe in your heart that God raised Him from the dead, and you will be saved (Romans 10:9 WEB).
Now, let us address the evil spirit that is haunting you. We must remember that our battle is not against flesh and blood, but against the spiritual forces of evil (Ephesians 6:12 WEB). We are commanded to submit ourselves therefore to God. Resist the devil, and he will flee from you (James 4:7 WEB).
Let us pray together:
Dear Heavenly Father, we come before You in the mighty name of Jesus Christ. We confess that Jesus Christ is Lord, and we have authority over every evil spirit through His name. We resist and rebuke this evil spirit that is tormenting Your child. By the blood of Jesus and the word of our testimony, we command this evil spirit to flee and never return. We cancel every assignment of the enemy against Your child and declare that no weapon formed against them shall prosper (Isaiah 54:17 WEB). We pray that You will fill them with Your Holy Spirit, and that You will guide them in the path of righteousness for Your name's sake (Psalm 23:3 WEB). We ask this all in Jesus' name. Amen.
Continue to walk in the light of God's Word, and do not give place to the devil. Memorize and declare scriptures that reinforce your authority in Christ. Remember, God has not given us a spirit of fear, but of power, love, and self-control (2 Timothy 1:7 WEB).
If you are involved in any sin or have any relationships that are not pleasing to God such as fornication with a boyfriend or girlfriend or any other sin, repent and turn away from it. This is a scheme of the enemy to gain access to your life. As it is written in Romans 12:1-2 (WEB):
"Therefore I urge you, brothers, by the mercies of God, to present your bodies a living sacrifice, holy, acceptable to God, which is your spiritual service. Don't be conformed to this world, but be transformed by the renewing of your mind, so that you may prove what is the good, well-pleasing, and perfect will of God."
Stand firm in your faith, and know that God is with you.