How can one get rid of the marital unhappiness that has led to depression and the desire for suicide, especially with the husband's coldness and the absence of children, despite adherence to acts of obedience?

The believer must beware of despair and maintain [recitation of] ruqyah and adhkar. He must also strive to acquire the means that protect him from chest tightness and depression, and achieve for him inner peace and tranquility of heart. Among these are: faith in Allah, frequent supplication and remembrance, recitation of the Qur’an, maintaining prayers, showing kindness to people, courage and frankness, seeking beneficial knowledge, and wholesome recreation. Extreme caution must be exercised against even thinking about suicide.