That sounds like one hell of a wake up call indeed, lets hope it's brought him to is senses about the need to look after his diabetes..
Copeing with the fact that you've become a diabetic is pretty difficult, but the changes and regimes that you need to make to your lifestyle can be a lot harder... As it feels like you are changing your indentiy changing into a different person, if you'll in a relationship it can be frighting indeed, as you built your relationship with who you were... It becomes scary how this is going to fit into the relationship and will it cope with the new you and all the changes.. So even though you want him to make the chages that he has to make he still might feel that if he does he might actually end up losing you... It's not a negetive against you he wants to hold onto you, the way he knows how is being the person that buit your relationship the non-diabetic as he knows that is the person you understand and care about... He's not sure if you like the new person he has to become if that makes sense?
Changing is going to be difficult, and may mean at times for you it feels as he's taking one step forward and two backwards so he will need time to adjust etc...And all you can really do is reasure him that well you've been there for him over the last 6 years, so you'll likely to stick around...
As to how you feel about his hypo's, well it's natural at times to feel angery, I'm a diabetic as well as my husband, and I still could have crowned him last week, when he didn't bother to check his BG's before we took the dog for a walk at the ponds... Then didn't mention that he was getting low around the ponds when I noticed something was wrong he had started the usual stupidity and difficult to handle stage, when we are half way around the ponds, light fading fast (he has no night vision) it's 1/4 mile to either the car park where the car is parked or the other end to where the ponds join a housing estate, I've got no mobile phone on me (forgot it) and I can't leave him to get help as he would likely end up in the pond etc etc... Who can blame me for being angery that he hadn't checked his BG!