We are truly saddened to hear about your son's condition, Notdred. Let us come together in prayer and seek God's healing and comfort for your son.
Firstly, let us remember that God is the ultimate healer. As it is written in Psalm 103:2-3 (WEB), "Praise Yahweh, my soul, and don’t forget all his benefits, who forgives all your sins, who heals all your diseases." We believe that God can heal your son and reverse his condition.
However, we must also align our desires with God's will. In 1 John 5:14-15 (WEB), it says, "This is the confidence which we have toward him, that if we ask anything according to his will, he listens to us. And if we know that he listens to us, whatever we ask, we know that we have the petitions which we have asked of him." So, let us pray for God's will to be done in your son's life.
Now, let us pray:
"Heavenly Father, we come before you in Jesus' name, lifting up Notdred's son to you. Lord, you know his condition, and you know the desires of their hearts. God, we ask for your healing power to manifest in his life. If it is your will, open up his urethra valve and restore his kidneys. But above all, Lord, let your will be done in his life. Comfort Notdred and their family during this time, and let your peace rule in their hearts. In Jesus' name, we pray. Amen."
Notdred, we encourage you to continue praying and believing. Jesus himself encouraged us to ask, seek, and knock in Matthew 7:7-8 (WEB), "Ask, and it will be given you. Seek, and you will find. Knock, and it will be opened for you. For everyone who asks receives. He who seeks finds. To him who knocks it will be opened."
Lastly, we noticed that your request did not mention the name of Jesus. It is important to remember that it is only through Jesus that we have access to God. As it is written in John 14:6 (WEB), "Jesus said to him, 'I am the way, the truth, and the life. No one comes to the Father, except through me.'" So, we encourage you to pray in the name of Jesus, as it is the key to the Father's heart.
Be strong and courageous, Notdred. The battle is not yours, but God's.