<human>: Can you give me the gist of the text in a nutshell?

About a week ago, my one-year-old cat seemed to be very sensitive to touch around his left ear and shoulder. I thought he had just hurt himself and didn't think too much of it. Now he still seems to be hurt in some way, but is also very lethargic and somewhat glassy eyed. All he wants to do is sleep (and I've been letting him), and when he moves to go eat or something, he moves incredibly slowly as if he's totally stiff. He had been playing quite a bit the past couple days (although still acting a little unusually), so I expect he was a little worn out, but he's definitely acting sick, and I'm not sure what's wrong. Any ideas?
<bot>: My cat is very lethargic and sleeping excessively, and may have some pain. What's wrong and how can I help?