I have been experiencing very sharp stomach pains typically about an hour after i eat. most of the pain is localized to my upper abdomen. when it happens, i cannot move or the pain becomes much worse. my mouth waters perfusely. often times i vomit which makes the pain go away a little. afterwards, my stomach feels very delicate and i'm scared to eat food. what could be causing this? it has been going on for about a year. at first i would only get it about once every three months or so but now i'm getting it just about every week.