One of the greatest benefits of sending salawat upon the Prophet (Salla Allahu alayhi wa-sallam) is that Allah will remove all anxiety from you. All three classifications, as a psychiatrist friend told me, of mental illness relate to various degrees of anxiety. And here we have an extremely practical way to prevent—and to remove once we've been afflicted with it—anxiety in all of its different forms. One of the things that I found (...): I have never seen anyone who sends abundant salawat upon the Prophet (Salla Allahu alayhi wa-sallam) that's not a happy and cheerful person, personally. I have never met someone who I know has a strong connection with the Prophet (Salla Allahu alayhi wa-sallam) and sends abundant salwāt upon him (Salla Allahu alayhi wa-sallam) except that they tend to be the lightest of spirits. They tend to be the most jovial and cheerful people—from the blessings of our Prophet (Salla Allahu alayhi wa-sallam).
(Shaykh Yahya Rhodus)