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I am sorry to hear you are worried about your puppy. My name is Rebecca. I am a veterinarian and will do my best to help.
Promethazine is not a drug I would recommend for a puppy. It has not been used or studied much in dogs, according to my drug book, so you would be experimenting with the dose and the side effects and I would not recommend doing that to such a young dog. Fatal respiratory depression has been seen when it was used in young children and I would be worried about the possibility of something similar in a puppy.
You could give famotidine (Pepcid AC). How much does the puppy weigh?
I have not heard back from you; I hope you were able to see my response. How is he doing?
Let me know if this was helpful and if I can answer any other questions.