Just another update. My vet looked at his results and wasn't so inclined to do a U/S yet. Her whole thought process is that this all resulted from us gradually switching Gizmo over to an adult food which can cause a big GI upset. She also stated that she's had many dogs come in with GI issues similar to Gizmo's and it was an infection in the tract and antibiotic seemed to do the trick. She thought that 22 was above, but not really high (sound familiar Crystal?

) However, she didn't want to rule it out completely since it' so common in the Yorkie breed. And increase in lypase can simply be from just a GI upset.
She watched him physically interact and also stated that his balance isn't off, he's not confused and it's good that he wants to play so badly.
In the end, we were sent home with a can of Science Diet W/D because she too thought that L/D was too high in fat. And also said to entice Giz I could warm up some chicken stock and put it on the food as well. We were also sent home with ear drops because he has a yeast infection in his left ear and I actually had an extra mix of Clavamox at home and was told to give him it twice a day.
He's going to have a new blood panel done in 10 days to see where everything is at. I can't thank everyone enough for the kind words. Gizmo right now is sound asleep on his bed in the kitchen sunbathing. It was a rough day.
Also, when we got home, I mixed in the wet food with the stock on top of the dry, and Gizmo literally went bananas and ate almost everything.