Note, that there is a huge difference between pain and suffering, and I’m not talking about suffering in this post. If you are suffering, get help if you can.
But I do think that the experience of bad, even painful emotions can be a blessing. The best things in life are difficult and only though pain can we grow and achieve them. Without struggling there is nothing of worth to be gotten.
The ability to experience sadness, pain, loss, etc. should be reflected upon considerately and appreciated. In the same way that someone you dislike might bring points of value to a conversation, your varying emotions should be viewed as such and allowed to speak within your mind. You should not entirely shut out negative emotions. For one, listening to them is really the only way you can address the cause of pain in your life. Turning a blind eye to negative events, emotions, or issues in your life will not solve them. One (including me) needs to identify what in their life causes which emotions to speak up and listen. Second, the skill to listen to emotions ought to be practiced impartially. If you cannot learn to appreciate the negative experiences in life and learn from them you also won’t be able to fully appreciate the positive experiences in life and enjoy them.
By appreciating negative experiences and emotions you can better experience and learn from life events that cause pain and more fully enjoy your life around those emotions.
Grieve at the loss of a loved one and realize how the depth of your sadness is caused by the joy they gave you throughout your life. Be motivated by incompetence or embarrassment to drive you to self improvement. Be conscious of when the negative emotions arise and when they leave; take note of where and why they leave and when they are rare. Cherish your ability to experience.