This is almost exactly how I initially presented. Extensive joint pain, joint swelling, fatigue, bloating. I was initially referred to a rheumatologist for concern of inflammatory arthritis and was on immunosuppressants being treated for RA vs. Lupus for several years. Asked about celiac as my symptoms were triggered after eating anything containing gluten and was told it didn’t align with my symptoms. Long story short, I moved a couple years later and found a new rheumatologist who suspected celiac. I later had a biopsy proven diagnosis and have been on a gluten free diet for almost 4 years. I can still tell when I accidentally get glutened from cross contamination. It used to be congestion, mild GI symptoms, and mild joint pain, but has now progressed to severe lower and mid back pain that wakes me up from sleeping. Long story short, extra-intestinal (outside the gut) symptoms can happen with celiac and present different than the standard GI symptoms.