VNS - Vagus Nerve Stimulation
Typically a treatment for epilepsy, Vagus Nerve Stimulation may provide the answer to extreme disorders. Simply put, a small pacemaker like contraption is connected up to, yes, your vagus nerve. It sends frequent but mild stimulation to your brain, resulting in an antidepressant effect amongst others. It is generally regarded as more effective than drug therapy. Many people don't feel the shocks, whilst others aren't so lucky. The energy levels of the device can be toned down very easily to a more acceptable level and can be turned off altogether if it's causing unpleasantness.