Every since I was a small child, I will occasionally have an episode of feeling a very primal, powerful need to FLEE, and my body will involuntarily seize up and cause me to leap into the next room. Sometimes a family member arrives home, and I have an inexplicable urge to hide; other times I have the sensation that someone is behind me when I am alone, and that I need to run. I have no history of abuse or trauma--where does this come from? It leaves my heart racing and I have no control over my actions.