Charlie, my hamster is 3 years old. He was fine this morning before church. When I got home, he was in his cage, laying on his side. His hands and feet were trembling rapidly. I picked him up and he laid the same way in my hand. He stretches every once in a while and archs his neck and back and squeaks, then goes back to listless trembling. Every once in a while, he opens his eyes. He is still pooping and peeing even as he lies there. What is wrong with Charlie and what can I do for him?