Thanks for all of the concern!
About halfway through the night he came out and was lying on his bed on the floor (usually he sleeps with us). It was an improvement. He did go out to potty (both) in the middle of the night and this morning...totally normal.
He was wandering around this morning while we were getting ready.
I think he was just traumatized. Boyfriend went home to check on him at lunch and haven't heard anything to worry about yet.
Will keep everyone updated!
I also forgot to mention that my other yorkie, Maggie, was diagnosed with whipworms while we were at the vet
They said it wasn't a bad case at all and she probably just got it. We just moved, so I'm thinking all the dogs at this apartment complex is where the issue originated. Max was negative. So, she took the medication while at the vet and we're going to wipe their feet off with their puppy wipes every time they come in from going potty.