Like "Don't panic....you will raise your blood glucose, rely on your "Emergency" plan of action (if you have one) if not, here is one:
http://www.jdrf.org/files/Life_with_Diabetes/lifenewsletter/DiabetesEmergencyChecklists.pdf
These may also interest you:
http://ndep.nih.gov/media/sample-emergency-care-plans-for-hypoglycemia-and-hyperglycemia-508.pdf
http://www.columbia.k12.mo.us/rbhs/parents/nurse/Diabetes%20Emergency%20Action%20Plan.pdf
http://www.maranausd.org/DocumentCenter/Home/View/4150
If possible can you leave a small diabetes kit (for emergencies) with your school's medical office?
I hope that this helps."