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I am sorry to hear you are worried about Trouble. My name is Rebecca. I am a veterinarian and will do my best to help.
How long has he been like this? Is Trouble an indoor only cat, or does he go outside?The first thing I would check for is a fever by taking his temperature with a thermometer. If you can do this, normal is 101 to 102; if he is over 103 he has a fever and that would explain not eating well, and sleeping more. If he goes outside, getting an infection that causes a fever might be the explanation.
How is Trouble today?