Drink plenty of water and figure out the reason for the spike cut down on complex carbs and excersise regularly. Keep a journal of your intake. And gradually drop off the foods that spike your levels, tc

Drink lots of water and don’t eat anything until it goes down .avoid food that will spike your insulin,like sugar and carbs

Off the cuff- take insulin,drink water,eat protein,do some exercise,sleep and wait .Investigate why it happened to avoid in future