I've seen a friend with Type 1 diabetes quietly and quickly go from someone who practices law competently to someone who can barely manage to stab herself when she realizes she's having a blood sugar issue. Dosage is hard when you're crashing.
Source: Type 1 diabetic.
https://www.youtube.com/watch?v=pC_0CI9jV6A https://www.youtube.com/watch?v=Bv4HIci1Qtc