I don't know either but I did find these websites that might help I hope you can find your answer on one of these sites
http://www.mayoclinic.com/health/multiple-sclerosis/DS00188/DSECTION=symptoms
http://www.fibrocenter.com/pain-symptoms.aspx?source=google&HBX_PK=s_fibromyalgia+symptoms&HBX_OU=50&o=34114361|212731527|0&skwid=43000000296598219