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: After becoming boiling hot, after slowly melting, my heart is frozen.
This tweet contains emotions: 
anger, joy, optimism, sadness