Hi your pain description does not fit into one particular diagnosis yes, burning and gnawing pain worsening with food can happen in acidity/ulcer problem it is unlikely to cause sharp or stabbing pain which usually suggests pain origin from abdominal wall. Its important to see which is exact sight of pain and how long it is there. You should get an endoscopy and ultra sonography to see the origin of problem and the decide on treatment some time it could be just dyspepsia or functional pain syndrome aggravated by anxiety hope this answers your query please do reply in case of any further questions wish you a speedy recovery