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it could be svt, the chambers of the heart not firing up correctly. Happens to humans too )- you get very short of breath during arrhythmia episodes and feel nausea. You get the feeling like something is stuck in your throat. I had trouble getting dx for this myself till I wore a heart monitor for several weeks. It is not anxiety causing it , but the electricity of the heart. Anxiety will stir it up though,Vet can give your fur baby a beta blocker. If your dogs have thyroid issues or female older this is more common. It takes a really experienced vet to check for it. If your dog is choking/ vomiting and seems like he will pass out & you dont live near a vet, you can dip him in very cold water or give him icechips to eat to shock his system and his heart back into rhythm. Google to see other svt things, gagging is another one that resets the heart electricity impulses. If the vet is not experienced and pushes on the trach to cause gagging they can harm it instead if it has a heart issue. I would not let my vet do that again. Sorry for a first post with no intro but this is something I have been through and was heartbreaking for me. I am here trying to look for a healthy yorkie for my teenaged daughter as I think her dog may not make it much further. They have increased risk of stroke with this disorder.