We hear the heaviness in what you are sharing and we want to stand with you in prayer, because you are not alone in this struggle even though it feels like you cannot talk to anyone about it. The Lord sees what is done in secret and He also sees your desire to be free, and He is able to deliver you.
We want to speak plainly about what you called gooning and continuing to watch. This is sexual immorality, it is lust and pornography, and the Bible calls us to flee from it, not to manage it or try to white knuckle it while keeping the source of temptation close. Matthew 5:28 says But I tell you, everyone who gazes at a woman to lust after her has committed adultery with her already in his heart. And 1 Corinthians 6:18 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. This is not to condemn you but to call you to repentance, because God loves you and wants to set you free from what is harming your mind, your body, and your soul. That brain fog you describe is very common when the mind is constantly fed with lust and dopamine from this sin, and God promises to renew our minds when we turn to Him. Romans 12:2 says 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.
You asked if you should be away from your phone to make it to day 90 in November and if the fog can lift before then. We would encourage you strongly that if your phone causes you to stumble, remove it or radically restrict it. Jesus taught in Matthew 5:29 If your right eye causes you to stumble, pluck it out and throw it away from you. That means taking drastic practical steps. For you that may mean putting strict filters on your phone, keeping it out of your bedroom, fasting from it at night, giving the password to a trusted Christian brother or pastor, and never being alone with unfiltered access. A 90 day milestone is a good goal for discipline, but our greater goal is holiness and a clean heart before God, not just counting days. Psalm 51:10 says Create in me a clean heart, O God. Renew a right spirit within me. The fog can begin to lift much sooner than November as you walk in repentance, fill your mind with Scripture, pray, get consistent sleep, drink water, walk and exercise, and bring this into the light with another believer. James 5:16 says Confess your offenses to one another, and pray for one another, that you may be healed. You said you feel you cannot talk to people, but healing often begins when we do talk to a godly, trustworthy man, a pastor or counselor, who can hold us accountable. 1 Corinthians 10:13 reminds us No temptation has taken you except what is common to man. God is faithful, who will not allow you to be tempted above what you are able, but will with the temptation also make the way of escape, that you may be able to endure it. God will make a way of escape, but we must take it.
We noticed your request did not mention the name of Jesus, and we want to lovingly share that it is only through Jesus Christ that we have access to God and can be saved and set free. John 14:6 says Jesus said to him, I am the way, the truth, and the life. No one comes to the Father, except through me. And Acts 4:12 says 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. We are forgiven and cleansed not by our streak or willpower, but by confessing our sin and trusting in what Jesus did on the cross for us. 1 John 1:9 says If we confess our sins, he is faithful and righteous to forgive us the sins, and to cleanse us from all unrighteousness. If you have not yet put your trust in Jesus as Lord and Savior, we urge you to believe in Him, confess Him as Lord, and ask Him to forgive you and be the Lord of your life. Romans 10:9 says that if you will confess with your mouth that Jesus is Lord, and believe in your heart that God raised him from the dead, you will be saved.
We pray together for you now.
Father, we come before You in the name of Jesus Christ and we lift up this dear one to You. You know the isolation and shame he feels, the brain fog, the feeling of being trapped with no way out, and the cycle of watching and wanting to stop. Lord, we ask You to forgive him for sexual immorality and lust, to wash him clean by the blood of Jesus, and to create in him a clean heart and renew a right spirit within him. Give him courage to confess this to You and to a trusted brother so he is no longer fighting alone. Help him to flee temptation and to take the way of escape You provide. Give him wisdom about his phone, to remove what causes him to stumble, to set boundaries, and to fill his mind with what is pure and holy. Philippians 4:8 says Finally, brothers, whatever things are true, whatever things are honorable, whatever things are just, whatever things are pure, whatever things are lovely, whatever things are of good report, if there is any virtue, and if there is any praise, think about these things. Renew his mind, Lord, lift this fog, restore clarity and peace before November comes, and sustain him day by day to walk in purity, not by his own strength but by Your Holy Spirit. Let this 90 day goal become a testimony of Your delivering power and lead him toward a life of holiness, and one day if it is Your will, toward a godly marriage that honors You. We ask all this in the mighty name of Jesus, our only hope and Savior, amen.