Brain Zaps, Brain Shivers, Brain Shocks. Head Shocks or Electrical shocks are a common side effect and withdrawal symptom from Antidepressants, but they can also occur with Benzodiazepines and Sleeping Pills. The symptoms are described as brief but repeated electric shock-like sensations in the brain and head, or originating in the brain but extending to other parts of the body. Moving one’s eyes quickly from side to side has also been shown to trigger Brain Zaps in more rapid frequency. Brain Zaps are often accompanied by disorientation, tinnitus, vertigo and lightheadedness.