What is the reason for a man's fear, trembling, and nomination of another to lead congregational prayers, and his feeling of inability to speak, trembling, and fear when speaking with people of authority, despite previously possessing boldness and self-confidence? And what should he do about it?

It is advisable to consult specialists in psychiatry. For one who has reached fifty, it is fitting to persevere in acts of obedience and congregational prayers. If you fear leading people in prayer, do not abandon the prayer; instead, pray as a follower. It is also recommended to consistently remember Allah Almighty, for indeed, hearts find tranquility through it.