Task: Identify the primary emotion conveyed in the tweet and assign it to either 'neutral or no emotion' or one or more of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that best capture the tweeter's mental state.
Tweet: the sad moment when u hand in an exam knowing u failed and grieve by eating and sleeping
This tweet contains emotions: 
fear, pessimism, sadness