As the husband of a diabetic, welcome to Healingwell.
my wife is one of those people who needs to know everything about what is wrong with her, when she was first dx'd we joined a Diabetes Forum. There weren't that many around (AOL and CompuServe were the big info areas). Anyway, may I suggest that you sit your son down and have him go thru the messages on this forum and see what is happening and how other people are dealing with DM. My thoguhts being that if he knew where he could talk to others with DM, then could find out what others are doing with their lives. <caution, learning experience there>
Its a good place to ask question, too.
He should remember that he is capable of doing whatever he wants to. Getting his bg's stable is the first step. Learning how to keep them stable and listening to his body when he starts to go low would be next. Then go from there. Its not always easy, but its better then letting the diease beat you down.
<okay gang, correct me if I'm wrong>
Hope that helps.
You do not really understand something unless you can explain it to your grandmother. - Albert Einstein
Knowledge is an unending adventure at the edge of uncertainty. - Jacob Bronowski