Rav Avigdor Miller on The Source of Emotional Problems
Q:
Are emotional problems considered yissurim?

A:
Certainly. But it depends how those emotional problems originated. Most emotional problems are the result of wrong middos. When people are נוקם ונוטר, they can’t forget what somebody once said to them, it boils in them and makes them sick. It’s only people who can forget, they can overlook what has been done to them, who can remain healthy. Just ignore it.

Like the gemara (Sanhedrin 7a) says: טוביה דשמע ואדיש – How happy is man who hears people saying things and he pays no attention, חלפוה בישתי מאה – a hundred evils will pass him by. You get excited that your mother-in-law said this or that?! You’re a fool; just forget about it! She didn’t know what she was talking about. Your wife said something to you? Forget about it – your wife doesn’t know what she’s talking about. Your husband said something – ignore it; he doesn’t know what he’s talking about. Pay no attention.

So, “How happy is the man who hears and ignores.” Just ignore it. Because when a person doesn’t ignore it, it eats him up. And he gets emotional problems. So therefore a person has to think sensibly – think about Hakodosh Boruch Hu, how many good things He does for you in this world. Think about how lucky you are to have two good eyes – most of you have two good eyes. You have something to eat, you have a bed to sleep in at night. You have so many good things in this life, so try to enjoy them. ראה בטוב השם – “Look at the goodness of Hashem,” and then your character will often straighten out and most of your emotional problems will become nothing.