Did you perhaps climb though a dense tree looking for your golf ball? That's why I am very stiff today. To be honest, it sounds like what someone I used to know reported as fibromyalgia. I don't believe fibro is a real disease, but I do think it is a misdiagnosis of other things such as, for example, lupus. Do you have an official diagnosis for the cause of this chronic pain? I hope you feel better after a rest day anyway. Remember: the stiffness is worth it because, even if you don't find your ball, there are almost always at least 6 other balls in there that others didn't bother trying to find.