I have been experiencing a burning sensation in my epigastric region which has been fluctuating in intensity since yesterday evening about 2 hours after I had dinner. The pain started suddenly, lasted for several minutes, and then disappeared almost as suddenly. It recurred this afternoon a few hours after I had eaten, but this time the pain has persisted for several hours, although waxing and waning in intensity. I feel somewhat nauseous but I have not vomited. Is this likely to be a gastric ulcer? I am 60 years old, female, I don t smoke or drink. I have been taking blood pressure medicine for about 15 years, and I am not overweight.