I feel for you. I was diagnosed in 2006. You do your best to eat gluten-free -- trust me, it's easier now than 15 years ago. But I always know when I've had some cross-contamination, and the right side pain is one a handful of symptoms. For me, it lasts 1-3 days and may also include bloating, gas, belching, brain fog, joint pain and pooping issues. Oh, and...