How to over come anxiety and nervousness

Question :

Because of the problems of our times, much has been said about nervousness, anxiety, and mental disease. What can help to remove these diseases? And is a Muslim allowed to read certain invocation (Ruqya) over himself?

Answer:

First, we must know that the anxiety one suffers from falls under the category of things for which one's sins are expiated. If he is patient, seeking a reward from Allâh, he will be duly rewarded. Nevertheless, there is nothing wrong with someone reading those prophetic invocations that help dispel anxiety and nervousness, invocations such as the following:
"O Allah, I am Your servant, son of Your servant, son of Your maidservant, my forelock is in Your Hand, Your command over me is forever executed and Your decree over me is just. I ask You- O Allah by every name belonging to You which You named Yourself with, or revealed in Your Book, or You taught to any of Your creation, or You have preserved in the knowledge of the unseen with You. That You make the Qur'an the life of my heart and the light of my breast, and a departure for my sorrow and a release for my anxiety.

Allâh Almighty said:
"None has the right to be worshipped but You (O Allah); how perfect You are! Truly, I have been of the wrongdoers."

He also said:
"So We answered his call, and delivered him from the distress. And thus We do deliver the believers."

There is nothing wrong with performing Ruqya over yourself, for the Messenger of Allah used to do so when he would read the last three chapters of the Qur'an, blow on his hands, and then pass those hands over his face and the rest of his body.

Source:
Ibn 'Uthaimin
Fatawa Islamiyah, Vol. 8 Pages 308-309