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Greetings of the day
The cause of vomiting
could be due to post nasal drip
because of cold
Continue giving nebulization, apart from it would like to suggest you following.
1. Steam inhalation 15 minutes session each for twice a day it will help relieve his nasal congestion
2. 100 ml of milk+10 Tulsi leaves+2 gms fresh ginger+1/2 spoon of turmeric +1 spoon of sugar . Boil it and give him sips of it hot. It will take care of throat congestion
I hope it helped
In case you require any further assistance,will be glad to assist you.
Dr Deepak Kishore