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'm slugging vitamin D pills by the handful, like they were m&amp;ms. When will this eternal winter end?! #Melbourne #grim #overit
This tweet contains emotions: 
anger, disgust, sadness