A simple test doesn't always diagnose the problem! Continuing to eat gluten (if a possibility of a problem) MAY cause neurological problems. Symptoms of Celiac are not just gastrointestinal problems but can be iron deficiency, joint pain, fatigue, migraines, skin rash, & many others. This is a disease and it DOES NOT go away!
There are a number of naturally gluten-free foods such as cheese, chocolate and coffee that contain proteins so similar to gluten that your body confuses them for gluten. When you eat these foods your body and immune system react as if you just ate a bowl of whole-wheat pasta.