I thought I'd comment since it seems we have an awful lot in common- you joined the group I started of Jewish diabetics, you're about to student teach (I did my student teaching in the fall of 2009), you're interested in autism (I'm autistic), you're on shots (I am too- and I hated the I-Port), and so forth.
Anyways- about teaching with diabetes- the worst was/is going hypo while teaching, but I'd just pop a mint and keep going. When I teach (I now teach after school classes), I generally aim to be a little bit higher, and keep mints in my pockets. I so far have not done an introduction to the class that is about diabetes, but if kids ask why I'm eating a mint, or what I was doing when I checked bg and injected while eating lunch with my students (I student taught 7th grade and ate lunch with them), I told them. And now that I wear a Dexcom, when kids ask what it is, I tell them that too.
One thing though- if they ask questions about you, tell them they can join you at lunch (or recess or after school) and ask the questions then. Because right at the moment you are teaching about math (or whatever you teach), not about sidkd5.
With my after school groups, keeping my introduction at the beginning to a description of what we'll be doing is what works best but in retrospect I think I should have let kids do a Q &A right at the beginning when I student taught, because I'm so visibly different, and because I did a worse job of hiding my differences than I thought I would.

Hello and Welcome!

Welcome to TuDiabetes! Check out some of the groups on the site. It is a great way to get to know the community.

hi there and welcome! you will find many teachers here, and we have a Group for them here

http://www.tudiabetes.org/group/teacherswithdiabetes