Ever wondered why when one bad thing happens (ie you get horrible news) you go turn around and run into the corner of a table or kick something and hurt yourself? Because your whole system is fired up and "busy". Your central nervous system doesn't forget. You may have had a bad week 3 weeks ago and you may forget about it, but if you don't take care of, or manage, that stress your body can still feel the physical affects of the emotional stress....because your central nervous system is still fired up.