Did he have a party?
Or is he on any medicine?
What it seems to be from your description of the symptoms is that it is some kind of odynophagia
We term it so and means difficulty and pain during swallowing.
It can be because of gastric fluid regurged into the eosophagus causing an esophageal burn and hence there is difficulty in swallowing.
see an ENT doctor and use tablets pantoprazole
40 mg daily with antacid
syrup 3 times daily