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: Panic attacks are the worst. Feeling really sick and still shaking. I should be a sleep.  #depression
This tweet contains emotions: 
fear, sadness