Analyze the tweet "This tweet is dedicated to my back pain, which I do not understand because I am youthful and spry. Full of life. Vivacious." and indicate which emotions from the list (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) are expressed. If no emotions are found, answer with "neutral or no emotion".
joy, optimism, sadness