Task: Assess the emotional content of the tweet and classify it as either 'neutral or no emotion' or as one or more of the given emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that best represent the tweeter's mental state.
Tweet: I don't think I can go to work tomorrow since val has left #GBBO I need a day to mourn
This tweet contains emotions: 
sadness