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Nausea after food intake can be due to:
1)Gall bladder disease:It may also be associated with belching,indigestion along with nausea.USG scan would help in ruling out.
2)Stomach or Duodenal Ulcer- The nausea and chest pain are present with food intake.
3)Reflux Oesophagitis -- It should be relieved by intake of antacids.Take TUMS empty stomach and observe for any changes if present.
Kindly visit a Physician so that after detailed evaluation appropriate diagnosis can be made and treatment started accordingly.
Take care!