An adolescent is brought into your emergency department by ambulance. On exam, you note hypertension, tachycardia, hyperthermia, and diaphoresis. He is agitated, hyperactive, anxious, almost delirious. Electrolytes show hyponatremia. A tox screen is negative for cocaine, amphetamine, and methamphetamine. A finger stick for glucose does not show hypoglycemia. An anonymous caller to the hospital tells you that the patient is one of his friends, and this was his first time, and he was really grinding his teeth earlier so they were worried.
Challenge: What's the diagnosis?