Food allergies or intolerance often come when we eat things too often. The Rotation Diet is great as a preventative measure, but it also may relieve symptoms caused by food.
Here is a link on How to Use a Rotation Diet

This is a blog post on using the Rotation Diet HERE  
See clip below

"The basic premise behind a 4-day rotation diet is that it takes that long for food to pass through your system and so you want to avoid eating any one food more than once every four days, otherwise you will most likely sensitize to it. Foods are grouped into “food families” and you can eat from the same food family every other day. You can eat two foods from the same food family on a single day (within an hour) but you must not eat any other food from that family for another 4 days. If you can’t manage to do a 4-day rotation diet, you could try a 3-day rotation and once you acclimate to it, add in one more day of new foods. "