Paroxysmal sympathetic hyperactivity
Paroxysmal sympathetic hyperactivity (PSH) is a syndrome that causes episodes of increased activity of the sympathetic nervous system. Hyperactivity of the sympathetic nervous system can manifest as increased heart rate, increased respiration, high blood pressure, perspiration, and hyperthermia.
Source: Wikipedia — Paroxysmal sympathetic hyperactivity (CC BY-SA 4.0)