Task: Determine the prevailing emotional tone of the tweet, categorizing it as either 'neutral or no emotion' or as one or more of the given emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that most accurately represent the tweeter's mental state.
Tweet: @MHChat I think sadness is felt very strongly physically and mentally.  It feels like it takes over and it's hard to focus at work #MHChat
This tweet contains emotions: 
pessimism, sadness