Classify the emotions found in the 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". Select from the following: anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust. If the tweet is emotionless, reply "neutral or no emotion".
pessimism, sadness