Wow I am having nearly the same condition. My feet, legs, and knees hurt all the time. But it is worse in the morning, and I am stiff as a board when I get out of bed.
I live in Florida, where good docs are at a premium. I have had these symptoms since I was 19 or so. It was a slow progression, so I pretty much ignored it until about 10 years ago.
My knees give me more pain and now my right hip hurts so bad, prevents me from sleeping about 1/3 of the night. The only medication I am taking for it is hydrocodone.
For many years, pediatricians, nutritionists, demographers and experts in all sorts of fields have been concerned about the rising rates of childhood obesity.