Sorry you are having such a hard time with food intolerances. I sympathize because I have major food restrictions too.
I hope you are keeping a log/journal of your foods, drinks and medicines. I found this handy to go back to even a year or more later.
I hope you had the biopsy for celiac, as the blood test is ntoriously unreliable.
Don't eat two new foods the same day on your elimination diet. If you find you have a problem with wheat, don't drink milk or eat any dairy until you go back to not eating the wheat. It's too easy to confuse which foods are the real culprits.
Fortunately for us lactose intolerant people, there are now Lactaid ice cream and frozen yogurt in the ice cream sections of the larger grocery stores. I only tolerate a couple of brands of yogurt, mainly Activia. Some of the really nice Greek ones and others that purport to be thick, have additives, including powdered milk, which I don't tolerate.