im 39 and have been very healthy all my life . . i have just recently started becoming very stiff when i sit down for any time at all...i feel like i cant hardly get up but once i do im ok. . ive never been like this before. . my periods have also gotten alot worse recently . . i feel tired all the time and im getting headaches more often than i ever have ? im under 100% more stress now than i have ever been in my life could this be an effect of that or something else?