Yep - it can be a problem when your sugars are high
On another note, it seems your hubby is stuck in the "what's the point?" mindset & is self-destructing a little.
Unfortunately, where I work, I see people everyday who have lost a limb/limbs to diabetes & some of them still take 3 sugars in their tea.
You know yourself that you can't do it for him & it might take a major scare to 'shake him up & wake him up'.
I hope he comes round sooner rather than later as it isn't fair to be putting YOU through all this stress too - you're having to watch someone you love slowly kill themselves & he is just pushing you/your help away.