Hi, thanks for the query.
There are two possible reasons
1 over feeding
2. Hyper acidity.
Feeling of nausea
was a first indication that you have begin gastritis
in your stomach due to over eating.
Over eating and gastritis are sufficient to cause vomiting
, that's happen in your case.
Now you have to take some antacid
at the advice of a doctor and this will cure you.
2nd option is have lemon juice with luke-warm water 3-4 times with a interval of 3-4 hrs .
Good luck. Dr. HET