Maybe you can find a doctor who specializes in this in your area, or maybe a naturopath or homeopathic doctor. Or maybe even a nutritionist. It is my understanding that these kind of doctors are more likely to identify complaints with celiac or gluten issues.
I don't have any definitive answers, as I'm new to this too, but I would say that if you have ALWAYS felt bad except for the time that you ate no bread, that is an answer. Whether that is celiac, I don't know. We have foregone getting a diagnosis from a doctor and have opted to do an elimination diet. It's only been 6 days, but I feel like I have seen/felt enough to know that something is going on. Your own body is the best diagnostic tool there is. Trust your instincts when it comes to your health!