Wheat intolerance - reintroducing after a period GF?

[HadALittleFaith]

I wondered if anyone else has experience of this. I have bad IBS. Been tested for coeliac disease but it was negative. I did an elimination diet and wheat is definitely a trigger. I went GF over 5 years ago and my symptoms have massively improved. However now I have a fast, significant reaction when I do eat wheat. I've heard that some people's intolerances settle after a period without it and they can reintroduce it. Does anyone have experience of this? How did you go about reintroducing it? Or am I doomed to eat GF forever? (I can cope with it, it's just rather limiting!).

[NothingsLeft]

How was coeliac ruled out? My bloods were negative but my biopsy showed significant damage to my intestines.

[HadALittleFaith]

Only by blood tests, never been offered a biopsy.