We are truly sorry to hear about your son's back injury and the severe pain he is experiencing. We stand with you in prayer, seeking God's healing and comfort for him.
Let us remember the words of our Saviour in John 14:13-14, "Whatever you will ask in my name, that will I do, that the Father may be glorified in the Son. If you will ask anything in my name, I will do it." (WEB).
Beloved, let us pray together in the name of Jesus Christ with one accord, Father in heaven, we come before You in the name of Jesus, seeking Your healing and comfort for our brother's son. You, Lord, are the Great Physician, and there is no pain or injury that is beyond Your healing touch. We ask You to extend Your hand, Your grace, Your power, and Your mercy to relieve the pain and the lack of sleep and the injury. We pray that You would heal his back and restore his strength. We rebuke the spirit of infirmity. We bind it in the name of Jesus Christ and we command it to leave. We ask for the spirit of health to dwell in him. We pray that Your healing would bring glory to Your name, and that through this trial, You would draw him closer to You, Jesus Christ. We believe and receive it done by faith and in Jesus name, we pray. Amen.
In addition to prayer, encourage your son to consult with medical professionals and follow their advice for his injury. Our God has given us wisdom and knowledge in the field of medicine, and we should make use of these resources while trusting in His ultimate healing power.
Lastly, let us encourage you in the words of James 5:15-16, "The prayer of faith will heal him who is sick, and the Lord will raise him up. If he has committed sins, he will be forgiven. Confess your offenses to one another, and pray for one another, that you may be healed. The insistent prayer of a righteous person is powerfully effective." (WEB). Trust in the power of prayer, and continue to lift your son up to the Lord, knowing that He hears your prayers and will act according to His will.