Can anyone shed some light on this medical situation?

Neuroglycopenia. It's a form of Hypoglycemia. You're probably undiagnosed. It can go unnoticed until late in life due to eating habits that more or less provide a form of self-medication; IE, all the energy drinks you consume. Go to a doctor with a list of your symptoms and ask him about Neuroglycopenia, or any of the Hypoglycemic conditions. You can probably get it under control by regulating your eating habits.