Diagnosed with Fructose Malabsorption but symptoms disappeared for a year? Why?

So I'm going to try and be short and to the point. I have had various symptoms for many years mainly gi distress and as of lately more anxiety, fatigue, and depression. I was technically diagnosed with Fructose malabsorption from the University of Iowa a couple of years ago. I never could really stick to the diet because its very hard for me and I kind of felt the diagnosis wasn't accurate. The reason I felt it wasn't accurate was because several years before the diagnosis I had a period of roughly 12 months of having absolutely no symptoms or problems of any kind, the best way I can describe it is I felt normal.

I was wondering how this is possible with having a problem like fructose malabsorption? Or if anybody has any educated guesses or experiences similar to this? Could I possibly have forced it into remission some how? Or maybe it was just a freak incidence?

Also during this time frame when I had no symptoms I ate very poorly so I know it wasn't from my diet. And responses or feedback would be great thanks.

Thank you for the response, sadly I don't feel well now my symptoms have long since relapsed. That is why I am currently seeking some answers, I have now been on a fructose free diet for 2 weeks after doing a much more strict diet for 4 weeks and still have no relief and my symptoms are so painful. I wish I could find an answer that works.