Determine the emotional tone of the following tweet: "This tweet is dedicated to my back pain, which I do not understand because I am youthful and spry. Full of life. Vivacious.". Use the provided emotions: anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust. Respond with the emotions you identify or "neutral or no emotion".
joy, optimism, sadness