He refuses to trust doctors but something major is wrong

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My boyfriend had a sister who ended up dying of leukemia years ago due to the ineptitude of her doctors in diagnosing her problem over a two year period. He refuses since then to trust doctors, and he feels that even if there is something wrong with him he would rather let it kill him than go to those charlatans. I have a little more faith in the medical community but not much. However we suspect that the bf may have diabetes, because his feet are always numb, and he is always exhausted but cannot sleep well. I have begged him to go get a check up and find out whether or not he does, but then he looks at me like I am in league with the doctors. Diabetes is a controllable illness when caught early enough, if not caught early enough it is a killer. How do I get him to go to a doctor when he doesn't want to? Is there any homeopathic treatment that any of you know of for diabetes that we could try? If the symptoms abate then we would at least know that we were right. I am thinking about buying a home glucose meter and checking his blood sugar myself. But then I feel like I am enabling him to continue to ignore the problem.