Thank you for your query.
It is not unusual to have varying blood sugar levels in a Type I diabetic. Regular monitoring is very essential.
Blood in stool
needs to be evaluated and investigated. Fresh blood is usually from the colon
onwards and your son may require an endoscopic examination by your doctor. I would suggest that you fix up an appointment with your doctor for the needful to be done.
I hope I have answered your query to your satisfaction.
Wishing your son an early recovery.