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My name is***** and I am sorry to hear that Bless'ed is sick this evening. Shaking is often caused by pain or discomfort. If he was treated recently for stomach upset, I would wonder about intestinal pain, like gas bubbles or possible getting ready to vomit or have diarrhea. You may try taking him outside and encouraging him to walk around a bit to see if that helps get things moving.
Other sources of pain include back pain, which is also common in Yorkies.
Does this help? Do you have any more questions?
Kansas State University,
College of Veterinary Medicine Class of 2001