Brain cells stop. Most cells can use several sources for energy needs; brain cells can only use glucose. When there is not enough glucose in the fluid around the brain, the brain cells lack the energy to function normally and so stop working properly, and confusion results.
Treat hypoglycemia. Follow the 15-15-15 rule: check the sugar when you feel it is low. Once confirmed low, eat 15 gram carbohydrates (4 glucose tablets or 200 ml milk or 100 ml juice), recheck the sugar in 15 minutes. Once it has risen by 15 mg/dl go ahead and eat a regular meal. Update your doctor right away so they can review your medications.