I am similar to you. Some days my entire body hurts but if my hips, thighs, knees, ankles and feet are not hurting much I have amplified pain from the waist up. I find upper body pain for me is worst in the morning and often moves downward once I'm out if bed and moving around. It's different for everyone but I can defiantly say my worst pain is my upper half!
I've always thought it was strange, but the friends I have who are dealing with fibro are about 50-50 on where they have the most pain. About half for upper and the other half for lower. It was always such a mystery to me that one diagnosis could cause such different kinds of pain to different people, but that's exactly what it does.
My upper back is the absolute worst. I try different yoga stretches to get rid of the pain but it is always there 24/7. My legs come in as second. Often my muscles will just twitch on their own. Fun to watch. lol
The area that gives me the most troubles is my lower body, my legs and feet seem to be specially affected. I also suffer from joint pain; my knees give me some hell often. My back pain is 100% chronic... and to top it off I suffer from IBS :/ I'm just 26 by the way... been suffering from all this since I was 15 or 16.