I'm 27, and over the last few years had the onset of IBS-like symptoms. I had a few episodes of bleeding so I had a colonoscopy earlier this year which came back as completely normal, and I was diagnosed with suspected gastroenteritis and discharged. I had a blood test for coeliac's which was negative. The symptoms conditioned and so I did a food diary, which showed it seemed to coincide with eating lots of gluten.
In September, I decided to try eliminating gluten for a week initially to see if it had any effect, but by day 3 I was a lot better and all my IBS-like symptoms had disappeared along with the intense stomach cramps. I couldn't bring myself to eat gluten after that so continued eating gluten-free.
I've had a few instances recently when I've accidentally eating gluten (e.g. eating a pasta sauce that contained wheat flour). It's instantly made me unwell, so it seems like my sensitivity has increased after having excluded gluten for the last couple of months.
I'm not sure whether to go to the GP about it. I don't have a family history of coeliac's disease.