Stomach Ache from eating banana's

I have been on google for several hours and trying to find an answer to a problem I have been having. Several years ago I began having stomach aches after I eat banana's or anything that touches a banana. I can eat plantains and banana flavored items but not the straight fruit. I have never experienced this with any other fruit. The stomach ache is very intense for three to four hours. Is this an allergy or an intolerance??