what you are describing is an elimination diet - which is what is recommended at times when you (and all of us! lolz) can't figure out what we are eating that is making us miserable it's not extreme at all - make sure you keep a food journal (i don't know about you, but i can't remember everything i ate without writing it down) personally, i am leery of vitamin pills, and i have my vitamin levels checked every 6 months and they have all come back good without taking any supplements (except D - an i get that from my doc prescribed) it seems my body is absorbing nutrients again, so, no need for extra vitamins. many celiacs take b12 and find that is helpful. if you take a probiotic and still have indigestion (the big D - diarrhea) , maybe try to take one at night and one in the morning? and also, digestive enzymes are very helpful to help break down foods and maximize your body's digestive process. good luck!