Gluten free is only a fad diet to those whom do not have issues with gluten. It's a proven fact that many people without celiac disease, called non-celiac gluten enteropathy, are more sensitive to gluten than are celiacs. I have seen many doctors over the years, and right now, I have 3 of the best doctors since I have lived on Long Island. My neurologist is one of the #1 doctors in this state, if not in the US, he has diagnosed me with gluten ataxia, leaky gut syndrome, and small fiber sensory polyneuropathy caused by vitamin and mineral deficiencies due to gluten intolerance.
I have been under a doctors care since going gluten free. My doctors feel I am celiac whether my genes say I can be or not. Dr. Aleesio Fasano, one of the best known celiac/gluten sensitivity research doctors in the world, says that 5-7% of celiacs do not have DQ2 or 8 genes. I have double, nearly identical DQ1 genes, which are gluten intolerant+neuropathy genes. I have been gluten free for 11 yrs this month. Just because you do not feel you are reacting to glutens other than wheat, does not mean you are not. In the beginning, I didn't react to barley, not at all, but now, I can't eat any grains, simply because they all contain a gluten of some type, and I just happen to be lucky enough 
to be intolerant of ALL glutens, not just wheat, rye,and barley. Many people are diagnosed with celiac never having had any symptoms, it's diagnosed by accident checking for something else. These same people often times do not have any symptoms when they eat gluten by accident, so they don't even know it happened, yet it causes damage none the less.
I have had a complete celiac panel done, plus gene testing 4 yrs ago. Of course they can not do an endoscopy to prove celiac simply because I have been gluten free for so long and I will not eat gluten to prove to someone else that I am celiac...being that sick for months is not worth the diagnosis for me. My father (7yrs) and sister (11 yrs) both are diagnosed celiacs, plus my dad has to have at least one DQ1 gene for me to have two.
Please do not discount my knowledge simply because someone else has told you different. As a rule, most doctors out there know very little about celiac disease, many still believe it's very rare, even with the increasing numbers of diagnosed. For that matter, now they are recognizing gluten intolerance other than celiac at a much higher level.
Here are some interesting links for you:
http://www.glutenfreesociety.org/gluten-free-society-blog/the-many-heads-of-gluten-sensitivity/
The doctor in the above link is gluten intolerant, as are his children...he has diagnosed and treated many, many patients whom are not celiac, yet very ill.
http://www.living-gluten-free.com/gluten-intolerance-disorders.html
Plus one of the best books I have ever read on the subject:
http://www.celiacsite.com/blog/
Dr. Stephen Wangan is also a gluten intolerant doctor.
It's true, gluten is in so much and people take meds without even realizing they may contain gluten. Those meds often times are useless for a person whom can't have gluten and doesn't know it...the meds just make matters worse. It's difficult in the beginning to figure this all out, but it's not impossible. In my opinion, everyone would be much better off without gluten in their lives. Our bodies were never meant to digest gluten to begin with.