Thank you for caring enough to bring this young man before the Lord in prayer. God sees him and knows the weight he carries, the loss of his mother, the loss of his sight, and the daily sorrow of waking from a good dream to remember what he can no longer do.
What you describe is very much like the grief we see in the book of Job. When Job lost so much and sat in great pain, his friends at first did the wisest thing they did. They sat with him for seven days and nights and said nothing, because they saw how great his suffering was. Sometimes there are no quick answers for such deep pain, and simply being present and praying is the most loving thing we can do.
It is important for this young man to know that suffering does not mean God has rejected him or that he is being punished for a secret sin. Job was a man who trusted God and still suffered greatly. Being right with God does not give us immunity from sorrow in this fallen world. It is wrong to assume that if someone only had more faith he would not be blind or would not have lost his mother. That idea was the mistake of Job's friends, and God showed it was false. God does not cast away those who trust Him.
His grief must feel heavier than anything that can be measured. Job said his calamity felt heavier than the sand of the sea, and that his words were swallowed up by the pain. When a person says he is weary of life or wishes he had never been born, it is often grief speaking. The Bible faithfully records those cries, but those cries are not the final truth. Scripture teaches that death is not automatically peace and rest for everyone. True peace and rest are found only in being reconciled to God through Jesus Christ. Apart from Him there is no real hope, and with Him there is hope even in darkness. The man to be pitied most is not the one who suffers but still has Christ, but the one who suffers without Christ and without the joy of God's presence.
It is understandable that he dreams of the things he used to enjoy and then wakes to the reality of blindness, and that this brings anger and harsh words. Deep pain often comes out as frustration and words we later regret. God understands that struggle and is able to help him with it. He can give self control over the tongue and calm the heart that feels so stirred up.
Pain and sorrow are never pleasant, but God can use them as tools to shape character and to form us more into the image of Jesus. That does not make the pain good in itself, but it means God can bring good from it as He works in a life that is yielded to Him. The way to that peace is to become better acquainted with God, to listen to His Word and to keep it in the heart. When God gives quietness to a heart, no circumstance can take that peace away.
Let us pray for him now. Father, we lift this young man to You in the name of Jesus Christ, the only way of salvation. You see his blindness, his loneliness after his mother's death, and the sorrow that comes when he remembers what he has lost. Have mercy on him and draw him close to Yourself. Give him faith to trust You even when he does not understand, to say with Job, though You allow this trial, yet will I trust You. Forgive his sins through the blood of Jesus and give him a new heart. Grant him Your peace that passes understanding and a joy that does not depend on his circumstances but on Your presence. Help him with his anger and his words, that he may speak with grace and find strength to control his tongue. Comfort him in his dreams and in his waking hours, and let him know that You have not abandoned him. Shape him through this suffering to know You more and to reflect Your Son. In Jesus name we ask this, amen.