I was poisoned by a neurotoxin Ciguatera. For a year my life was wrecked. I couldn't read, drive, digest food, recall basic words, or exercise. All of this including my arrhythmia caused by Vagal Nerve dysfunction. I didn't begin to recover until my hormone levels were restored to that of a normal 45 year old woman. Then my brain began to heal. cBHRT literally saved my life.