I Have Experienced 6 Or 8 Times In The Last

I have experienced 6 or 8 times in the last 2 years, short periods of sharp throbbing type pain in my upper stomach area. More like a pressure in my esophigus. Drinking of water sometimes relieves. Carbonated soda also relieves slowly. Can't pin it down to something digested. Sometimes the pain occurs 6 to 8 hrs after having eaten anything.