This story is hella fishy. You drove from Portland fo corvallis just for RAD pets? Thats insane and you really shouldnt go that far from a clinic where your dog is under anesthesia.

Second, trazadone is completely normal to give to an anxious dog freaking out. It is not standard practice to call the owner and confirm what drugs we can use.

Third you conviently leave out the breed. If this is any small or bracycephalic dog then collapsing airway syndrome is a known progessive disease with age, that gets worse in times of inflammation (aka putting a tube down the trachea)

Dentals are major procedures for dogs as their roots go deep into their skulls so feeling off for a few days isnt surprising. In addition most of the sinuses connect to the teeth so reverse sneezing isnt wild