Dave is right on the money, i personally found out i had leaky gut when i did a imupro test and came back with 60 intolerances. It was then later confirmed with an indepth stool analysis that i had gut dysbiosis. Conventional doctors don't even get taught about this so you are better off finding a naturopath or nutritionist that deals with these issues.
Also do you get stomach aches a few hours after you have eaten certain foods?