All the symptoms seems to be related to acid peptic disease
The burning sensation is due to increased acidity in the stomach that is causing to vommit.
For treatment he should have an Antacid
such as PPI that include Esomeprazole
40 mg in the morning before breakfast and 40 mg in the evening before dinner.
For vommiting use Domperidone
syrup 02 TSF thrice a day before meals.
This is type of stress ulcer. In case of any stress either physical or mental can cause increased amount of acid production.
If not relieved have endoscopy
to demonstrate any ulcer.
I hope I am sucessful in solving your query if you have more you can ask me.
Dr. Azhar Sattar