What is the cure for extreme distress, fear of death, and the obsessive thoughts that have led to abandoning work and isolation, especially given that medical examinations have not revealed any organic cause?

Remembering death is religiously desirable, as the Prophet, peace and blessings be upon him, said: "Remember often the destroyer of pleasures." Fear of it motivates obedience and avoidance of sin. The described condition is an illness, requiring patience and striving against oneself. It is recommended to frequently supplicate, remember Allah, and seek refuge from Satan, while also consulting specialized doctors.