I am not sure what you asking, but since Justin doesn't want to go to the graduation party because he know he going to be embarrass from not gradating with the rest of his friends.
I believe the answer is a psychiatrist.
The healthiest strategies for coping with strong emotions would be being able to express it in non-destructive way. You can use these strong emotions to create poems and art, or maybe exhaust them in physical activities such as boxing or running. Also, you can engage in calming activities such as meditation and yoga. One good way is to share it to someone you trust or who can listen. Lastly, humor or being able to laugh at the things happening to you would be useful too.
Explanation:
The IPN should keep assessing the patient as well as consider changing their position.