[alaskayorkie]

I wish I could help, but you've done everything I would have done. All I can suggest is to see another vet -- and get the first one to transfer all the records to the new one.

I'm no expert. Things that come to mind are hypoglycemia as the vet suggested, reverse sneezing or collapsed trachea. None of them explains all the symptoms your pup is having.

Any signs of lethargy? That would back up the hypoglycemia diagnosis. But I don't think it explains the coughing.

Sorry I couldn't be of help. Definitely see another vet.