From time to time we can all get stuck in an emotion and lose perspective on that emotion. But when the emotion gets stuck and therefore the feeling persists for a long time or it is really horrible then we need to understand why this is happening. There is always a strong desire 'not feel this way' but that alone will do nothing other than deepen the horrible feeling.
It is really fundamental to recognize that you cannot change an emotion from inside of it but you can change it when you step out of it's pull and recognise the truth of your reality.
This video explains it in more detail.
Learn how your brain tricks you into thinking and doing all sorts of crazy stuff. You won't believe it.