Task: Categorize the tweet's emotional expression, classifying it as either 'neutral or no emotion' or as one or more of the specified emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that reflect the tweeter's state of mind.
Tweet: I understand now...if it's not pleasing to the ear...then it ain't what you want! I'm so so tired!!
This tweet contains emotions: 
anger, sadness