These are all good stories and glad you are feeling better. I don't deny that you feeling better corresponded with a change in your diet. Unfortunately it actually proves nothing at all. That's why studies are done up, to validate claims like that.
Maybe you had a sensitivity to gluten that was undiagnosed. Maybe there was another food in your diet (that also contained gluten) that you had an allergy/sensitivity to, but the gluten was not the issue. Maybe it was pure coincidence (happens a lot!). Maybe you actually just started feeling better due to a placebo effect. The list goes on.
Basically because you experienced change doesn't mean it was due to gluten - although maybe it was. Without controlling for variables there is no way of knowing.