Milk allergy!

Dawn • Hello, I`m 34 years old my wonderful husband is 34. We are new at this but TTC. I have a kid, trying 4-1 with him.
I had a allergy test done today and I found I am highly allergic to dairy caisen and Corn.  Which that is basically every ingredient in foods.  I'm not familial with strict diets but my dr highly recommends I get on  a dairy free diet.  Please let me know if you have those kind off allergies and what do you use to substitute it?  Thank you in advance.