This Celiac.com FAQ on celiac disease will guide you to all of the basic information you will need to know about the disease, its diagnosis, testing methods, a gluten-free diet, etc.
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What are the major symptoms of celiac disease?
Celiac Disease Symptoms
What testing is available for celiac disease? - list blood tests, endo with biopsy, genetic test and enterolab (not diagnostic)
Celiac Disease Screening
Interpretation of Celiac Disease Blood Test Results
Can I be tested even though I am eating gluten free?
How long must gluten be taken for the serological tests to be meaningful?
The Gluten-Free Diet 101 - A Beginner's Guide to Going Gluten-Free
Is celiac inherited? Should my children be tested?
Ten Facts About Celiac Disease Genetic Testing
Is there a link between celiac and other autoimmune diseases?
Celiac Disease Research: Associated Diseases and Disorders
Is there a list of gluten foods to avoid?
Unsafe Gluten-Free Food List (Unsafe Ingredients)
Is there a list of gluten free foods?
Safe Gluten-Free Food List (Safe Ingredients)
Gluten-Free Alcoholic Beverages
Distilled Spirits (Grain Alcohols) and Vinegar: Are they Gluten-Free?
Where does gluten hide?
Additional Things to Beware of to Maintain a 100% Gluten-Free Diet
Where can I buy gluten-free stuff?
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DGP can absolutely be false positive. Google will not tell you that but I have found multiple studies in journals showing this and have also been told this by two different celiac clinics. I myself test positive to DGP when the assay is ran one way and negative to it when run another way. It is only a matter of time before the rest of Google University stops claiming it is overwhelmingly accurate. The test is young, toughly 10-12 years.
How many biopsies were taken? Do you have the report? Is there any inflammation at all in the small intestine? Did you have the gene test?
If you still feel sick after some time on the gluten-free diet your health issues might not be gluten related. You might want to consider other diagnoses.
As for taking precautions in the interim, I am so sorry. My brother is celiac and they have a gluten-free house. When I was trying to see if cc was keeping me sick, I stopped even cooking at my boyfriend's and asked before even kissing him. Pretty sure he thought it was nuts too but he kept his mouth shut. This life can be extremely restrictive and more frustrating if you are still sick without an official diagnosis.
Cycling lady suggested that I try a plastic bin with my own pans, spoons, that I could tuck away from people. That might work for you.
Good luck! I hope you feel better soon and I wish your family was more supportive.
I think a lot of us can identify with his symptoms. The pattern you are seeing on his skin is likely something called livedo reticularis. In myself it seems to be related to inflammation. Before diagnosis the only thing that would alleviate this for me was an acupuncture session. it would be gone for a couple hours then reappear. I think it is associated with inflammation. Mine reappears if I am glutened or very cold.
You mention he had routine labs. Did they do a celiac panel? he may want to ask at his local hospital if they have a fund for folks without insurance. While my local hospital didn't cover doctors visits they did cover any lab tests and if they don't cover in full they may have a sliding fee scale. the other option is to have him go gluten free but it is best to try and get a diagnosis before deleting gluten if possible.
It might be helpful for him to come here if he is willing.
Celiac is genetic. That is why it is advised that all first degree relatives of folks diagnosed get tested before they go gluten free. If you have other family members who haven't been tested it would be best to have them blood tested before they go gluten free. You may want to consider going back to eating gluten for a bit so you can be tested.