Some schools of thought e.g. Endometriosis UK say that it is still being researched and maybe a form of auto-immune disease. Given that women (and men although much less!) can have Endometriosis and it's often mis-diagnosed as IBS what have members found themselves? It's often more than just 'painful periods' and people with it find they are tired, ache and have sharp pelvic/ back pains. Given that many Coeliacs are low in Vitamin D which helps balance many of the body's hormones could there be a link with CD or other auto-immune conditions?
Nutrition & Endom read on here ref why wheat free helps some people...
re pelvic pain "...look at digestion because if a person is not absorbing the nutrients correctly, due to whatever reason, that could also lead to more higher levels of pain perception in the body because they are not taking in the nutrients that would help dampen down the pain pathways.”
B12: "And the B vitamins, especially B1, B6 and B12 when taken in combination, work as well as any analgesic when they are in the right level in the body.
Source below
Autoimmune Thyroid Disease and Coeliac's Disease
Coeliac disease and Ménière's disease
Silent Coeliac Disease?
At home test for coeliac disease 
Coeliac Disease and Exercise
