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: I walked 3.4 miles today, the most I've walked since I got #rhabdo. Going back to work tomorrow.. here's to hoping it goes okay #nervous
This tweet contains emotions: 
anticipation, fear, optimism