If your goal is to become symptom free as quickly as possible, this is accomplished by avoiding the 5 common allergenic foods: sugar, dairy (except butter), wheat, corn and soy for 30 days. After 30 days you can challenge any allergenic or former trigger food to see if it is no longer a problem for you.If there are additional foods that you know hurt you (ie white potatoes, peanuts, garlic, shellfish, etc.) avoid them too. It is not necessary to have expensive allergy testing done. However, if testing for diagnosis is covered by insurance, or is not a financial hardship, go ahead and get all the testing you need to confirm your diagnosis of disease. This will increase your satisfaction as you witness the disease symptomology evaporating from your body.