Thank you all for your advice.
I know the answer is visiting the doctors. This is easier said than done, simply because if he found out we had been his wife is worried about his reaction. We have been told that the doctors won't tell him anyone has reported him unless he asks, then they would have to.
We are being patient, he's just being incredably subborn!! When he has been tested his bs levels must be ok and he tells the doc he's fine.
Thanks again, it's good to know support is out there xx