Hi and welcome to YT! I'm sorry your new puppy is sick. It was most likely due to the food change. Also Purnia is not a good puppy food so you might consider changing to a better quality now while he is on the antibiotics. There are many threads on good foods here that you could do a search on. Wellness and Solid Gold you can find at Petco and are both excellent foods.
The reglan was for the vomiting and that should help. Flagyl is also known as metronidazole which is an antibiotic for the stomach. your pup should be feeling better soon. Glad to hear its not parvo
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