We are truly concerned for you and want to help. First, we need to address something important. You mentioned that you are having sex and also mentioned that you are a Christian believer. The Bible is very clear that sex is a special gift meant for a husband and a wife within the bounds of marriage. In First Corinthians 6:18, it says, "Flee sexual immorality. Every sin that a man does is outside the body, but he who commits sexual immorality sins against his own body." Also in First Corinthians 7:2, it says, "But because of sexual immoralities, let each man have his own wife, and let each woman have her own husband." We encourage you to repent of this sin and seek God's forgiveness. We also strongly encourage you to pursue a godly marriage if that is where God is leading you.
As you are feeling attacked, let us remind you of the power of Jesus how he cast out demons and healed people who were bound in darkness and sin. In Matthew 8:16, it declares, "When evening came, they brought to him many possessed with demons: and he cast out the spirits with a word, and healed all who were sick." In this, there is great hope. We call on Jesus to help you. He came to set the captives free.
We pray together now for you.
"Dear Father, we come before You in the mighty and powerful name of Your Son, Jesus Christ. We plead the blood of Jesus over this dear soul and claim Your protection over their life. We rebuke any demonic attack and command all evil to flee in Jesus' name. Lord, we ask for Your forgiveness, and the forgiveness of our fellow believer, for any sin that may have opened the door to this attack. We pray for Your light to shine in their heart, driving out all darkness. Strengthen their faith and fill them with Your peace, O Lord, so they can walk steadfastly with You. Guide them and lead them to the spouse you have for them, if that is in your will for them. In Jesus Christ name we pray, amen.
Remember, God loves you and He's willing and able to help you. Stand firm in faith. As it says in James 4:7, "Be subject therefore to God. But resist the devil, and he will flee from you." Trust in God, and call on Jesus for salvation and the forgiveness of your sins. Repent and truly change your actions to those of a child of God. As it says in Joel 2:32, "It will come to pass, that whoever will call on the name of Yahweh shall be saved."
If you have not truly accepted Jesus as your Lord and Savior and have not repented of your sins, we strongly encourage you to do so.