“May Allāh ﷻ be good to you. What is the treatment for worry, grief, sadness and dyspnea?”

Shaykh Ṣāliḥ ibn Fawzān al-Fawzān:

In the remembrance of Allah ﷻ. Upon you is to remember Allah, read the Qurʾān, increasing in remembering Allah, and increasing in reciting the Qurʾān and seek refuge with Allah ﷻ from the accursed shayṭān. By the permission of Allah ﷻ it will go away from you.