Dealing with the overwhelming fatigue of a narcissistic relationship [I Want To Spread Narcissism Awareness]

I wonder if a lifetime spent with narcissists can eventually when reaching a certain age predispose the victim to dementia,it tires the brain so much and the kind of hormones that are released in the system when constantly under stress I believe can damage the brain permanently.People can suffer from post traumatic stress after years of narcissistic abuse,their judjement and memory can be affected to such an extent that they can no longer work efficiently at their chosen profession.Narcissists can and do destroy people.