My husband has celiac disease, which went undiagnosed until he was in his mid-fifties. As the disease progressed, and destroyed more of his intestinal villi, he did develop lactose intolerance as well, so this is not impossible. Once he got on a strict gluten-free diet, his intestines recovered and he is no longer lactose intolerant (basically he was unable to digest much of anything when it was at its worst).
Besides diarrhea, he also had skin lesions typical of celiac disease.
He now has colon and small intestine cancer - celiac disease raises your risk of small intestine cancer (which is otherwise rare), especially if it goes undiagnosed for a long time. Talk to your doctor about what screening you should do for this in the future. (My husband is OK, even though he was stage 4 at diagnosis, but there are signs that the cancer may be recurring).
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