As much as they might want to, our doctors, nurses, and nutritionists will never know enough to truly help us with our diabetes. That is why we must learn it all ourselves.
Let me let you in on a little secret: no matter when or how you are diagnosed you are always going to feel out of place. Everyone has a different story, everyone's bodies react a little differently. You can often find a common ground, but you will never find another you. And that's O.K. :) And in case no one ever bothered to mention this: it's not your fault that you have Type 1 diabetes. (I struggled with this feeling of guilt for years.)
As for "bad things", I believe we only have a menu of 3.(This does not include long term complications.)
1) low blood sugar (hypogylcemia) -which it sounds like you have experienced and know how to treat! [VERY COMMON-ONLY DANGEROUS IF IGNORED].
2) extreme low blood sugar- you pass out [RARE-DANGEROUS-NOT NECESSARILY LIFE THREATENING]
3) extreme high blood sugar (hyperglycemia) with DKA (diabetic ketoacidosis) [COMMON-VERY DANGEROUS-LIFE THREATENING]
See, it's not that bad! :)
As for educating your teammates/friends, I would take the time to
1) Explain what Type 1 diabetes is (they will comment with horror stories of how their aunt's sister's uncle's roomate died from diabetes, but just try to ignore them, they are just trying to help)
2) Explain the symptoms of a low blood sugar
3) Come up with a code word to let them know that you need help (help=giving you food, drink)
4) Show them when and how to use a Glucagon shot to revive you
I hope this continues to help and I hope that knowing what the worst case scenario is makes it all a little less scary for you.