I heard that the symphatic nerve was actually causing the changes in stomach hair gore,nails,nausea , sweat, many dr tries sympathetic blocks which I had but only makes my rsd worse, other than that I have no idea how they can control the reactions to that expecific nerve disorder .
Hope soon a better approaches came in because taking to many zofran also make me,in my case so constipated and there I add anther issue and another med to treat that as well.
Best wishes and gentle hugs,Jesika .