Research has shown that childhood trauma changes the brain. I grew up where staying on high alert was necessary for survival. Though I have worked through many of these issues, I am still highly reactive to my surroundings and hypervigilant. I have often wondered if this early hyperarousal of the sympathetic nervous system did not have something to do with me developing CRPS??? Will never know, but I find it an interesting thought. And NO I am not in anyway saying this is all in our heads (just for clarification.)~mac