Glad to hear that the vet appt went okay...even though you did have a bit of a scare. Good luck with little Pogo and keep us updated. I'm going to ask my vet about the natural anti anxiety/stress supplements. I feel so bad for my Meeko. He paces so much and has trouble settling down. Even the wind blowing the trees worries him.
He does not exhibit any aggression whatsoever. Quite the contrary, he is one of the sweetest dogs I've ever met.
He does the same thing with the pacing and not being able to settle down (even though I know he wants to so badly). 
The first time we took Meeko to the vet, I was drenched by his drooling. Just like you said! The similarities are uncanny! 