I agree with JDRF-VOL-RL that the
nosebleeds are more likely to be caused by something other than type 1 diabetes. I had nosebleeds at about the same age, and in my case it was allergy-related. My doctors suggested that I would "outgrow" the problem, and this is indeed what happened. It wasn't fun at the time, but it all stopped by the time I was about a junior in high school. No nosebleeds since then. I would ask his doctor about other allergy meds, or perhaps allergy shots.