Well, you know your post got me thinking. Around here, you are thought of not as a spouse or partner, but as someone with type 3 diabetes. Someone with type 3 diabetes is the parents, husbands, wives, significant others and family and friends of people with diabetes. When you have type 3 diabetes you may also have to deal with a lot of the stuff that type 1s and 2s deal with. And fear of hypos is right there staring many of us in the face. While you will certiainly find others in your particular situation, you may also find that the things you want to discuss, your fears of hypos and worries over complications (etc) are shared by many of us. There are certainly some groups focused on exactly the people you have identified. If you look under groups, you will find a group for Type 3 Diabetics which was actually started our founders wife Andreina Davila. And there is also a group for Married with Diabetes. And while you might not see the immediate connection, any parent of a child with T1 shares your concerns.
So, I'd like to welcome as one of us. Look around, ask questions, and please feel like you are part of the community, not just the partner of someone who has diabetes.