yes tina, there is a test you can do to determine this. ask your gastro-intestinal doctor to do an insulin-intolorance test. Not usually covered on insurance because it is considered "exploratory". the test takes about 40 min and is painless. they monitor your blood-sugar levels and bowel spasms.
hope this helps. you amy want to check out website for Dr. Mathias in houston texas. not sure of the exact address
jes;-)