my mother has suffered this aall her life, and a physio taught my father how to put the bones that were moving back 'in'- every night before she goes to bed he presses down on her back and 'sorts' it out. I don't know if this is of any help, but maybe is an option you could look into i.e. getting one of your parents to learn what to do, so you can get a bit of relief especially before bed... Good luck.