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: Why does having anxiety drain some much of your energy #anxiety #sotired #needtosleepforhours
This tweet contains emotions: 
fear, pessimism, sadness