If you have insurance coverage, a quicker way to discover your food sensitivies is by having a delayed food allergy test done. It's covered by most insurance companies. Go to http://www.foodallergytest.com.
You'll quickly find out what foods your sensitive to.. and after the elimnation phase, when you reintroduce the foods, you'll discover which foods do what to you.. some may give you gas, others headaches, etc.